Honestly, my experience is entirely anecdotal, and I completely admit that. I have not read this article yet, so I don't even know what the conclusion is (but I can make an assumption).
Disclaimer being what it is, literally all of the full-on racist people I know or have known are also MAGA conservatives. And conversely, all the MAGA people I know or have known are way more racist than average. I say that from the perspective that, at least in the USA, most people have racial biases to a certain extent.
I've been told things like "You don't have the right skin color to take the bus into the city", meaning because I'm Caucasian with "white" skin, I would somehow be an outlier among the rest of the folks taking the bus. Many, many times I've heard statements like "we can't even say [the N-word] anymore even though that's what they call themselves all the time" and let me tell you the people saying that don't say "N-word" they say the real deal that rhymes with chigger. They'll claim illegal "Mexicans" took their jobs, without a moment's thought about who hired those "Mexicans" or what nationality those "Mexicans" are. There's really no skin color other than white-white that doesn't receive some hate.
Anyway, this is just old man ranting at this point, and it may even be too long to be readable, so let me summarize it with FUCK RACISTS & FUCK MAGA.
I have known a ton of people like this. The hardest part of dealing with it is that sometimes they are right. It's typically a case where they came to the correct conclusion but arrived there by faulty logic and/or false information.
All they will ever recognize is that the were right, doesn't matter why or how. They never actually learned any lesson, they'll ignore the myriad other cases where they were absolutely wrong, while they continue to use the same baseless methodology to form future opinions and conclusions.