Yes, you can claim that. I asked you to show me where. At the very least a reference to where he says it, but you could quote him. I don't see why you think I should just trust your interpretation.
Marx hadn't lived in a time where there was a society that tried to jump to Communism immediately without developing the Means of Production first, so the closest we can get is his critique of Anarchism. Critique of the Gotha Programme also provides perspective on the transition to Communism:
What we have to deal with here is a communist society, not as it has developed on its own foundations, but, on the contrary, just as it emerges from capitalist society; which is thus in every respect, economically, morally, and intellectually, still stamped with the birthmarks of the old society from whose womb it emerges. Accordingly, the individual producer receives back from society – after the deductions have been made – exactly what he gives to it. What he has given to it is his individual quantum of labor. For example, the social working day consists of the sum of the individual hours of work; the individual labor time of the individual producer is the part of the social working day contributed by him, his share in it. He receives a certificate from society that he has furnished such-and-such an amount of labor (after deducting his labor for the common funds); and with this certificate, he draws from the social stock of means of consumption as much as the same amount of labor cost. The same amount of labor which he has given to society in one form, he receives back in another.
However, I encourage you to read Marx for yourself. You shouldn't "trust" my interpretation, you should dive into Marxism if you wish to critique Marxists along Marxist lines. You can critique as a non-Marxist, that's perfectly valid, but trying to critique as a Marxist without a solid understanding of Marxism isn't good-faith in my opinion.
Also, I am not making a value judgment about communism. Do not try to twist what I am saying into an argument against communism, because you are starting to look like you're here in bad faith.
I am not trying to say that you're making a value judgement. My argument is that, as a Marxist-Leninist that has read no fewer than 2 dozen books by Marx, Engels, Lenin, Mao, Parenti, Politzer, and other Marxist writers, it is evident to me that your understanding of Historical and Dialectical Materialism is lacking, and that clouds your judgement when you critique using Marxist analysis.
In my opinion, I did provide it. I could link The German Ideology and Socialism: Utopian and Scientific, and if you read them you would perhaps understand Dialectical and Historical Materialism better, but we are having a discussion on Lemmy. The capacity for sharing information and the expecations for a single thread of replies are very low.
Marx was incredibly intelligent, but he couldn't predict the future, thus, like I have linked in Critique of the Gotha Programme, the closest we can get is his insistence that the next Mode of Production emerges from the previous. Asking for a quote for him saying "communism is when you eliminate private property, struggle a ton, then bring it back in a controlled manner and gradually increase public ownership" won't happen, because the initial failure isn't necessary.
Imagine trying to build a modern cell phone with bronze-age technology. You can't, just like you can't materialize Communism through fiat without developing the Means of Production. Marxism isn't Utopian, ie it isn't about picking a good society and forcing it into existence, regardless of the level of development of the Means of Production. Marxism is Scientific, ie it focuses on historical developments, the Mode of Production is tied to the technological level of the Means of Production. Feudalism disappeared after the Industrial Revolution, largely, and not earlier. Having achieved a backwards, idealist, impoverished "communism" like under Mao and the Gang of Four goes against Marx's theory of historical development of class society, and China paid the price for ignoring that.
Theory must meet practice, and practice must inform theory. The PRC tried to establish Communism without developing the Means of Production adequately, readjusted, and has now rapidly developed. Holding an ultra-Maoist line like the Gang of Four that insisted it is better for the Proletariat to be poor under Socialism than rich under Capitalism is Revisionism. Maoist Theory regarding Class Struggle did not meet practice, therefore the correct choice was to take a gradualist approach while maintaining CPC control so that when the Means of Production are more developed, they can be more Socialized in turn as Socialism emerges from Capitalism.
This is insulting, especially considering you haven't attempted to respond to the rest of my comment, where I try to actually engage with modern analysis of a country Marx never lived to see and actively analyze. If clearly high-effort replies are considered "trolling" and "bad-faith" by your standards, then how can you consider your "gotchas" any better?