They were removed by the sub mods who are probably seething liberals angry at seeing a tankie show up with their foss offerings. Reddit admin removals are very obvious and though they may have delisted/de-ranked posts about the api changes (people were saying they did), I doubt they went into them, went down-thread and removed comments individually.
Christian himself is clearly a bog standard reddit liberal. "Wholesome 100" type and not terribly openly political on his main account (though who can say, he could be PCM's top poster on an alt).
Christian is also someone who makes his livelihood off of a reddit app. I mean he brings in big money, enough that he feels comfortable annually donating tens of thousands of dollars to animal shelters in fundraisers.
So telling a guy who subsists off charging people to get involved with a FOSS project which he may or may not be allowed to monetize (given the FOSS community's general reactions to paywalls) he should join a FOSS replacement may be a non-starter anyways. He's either going to have to get a software-dev day-job (and in Canada he won't exactly have pickings among top companies despite his renown and skill) OR hope reddit gives in (unlikely) OR launch himself into a joint project with other reddit devs on something he can monetize (either a site with ads or subscription or a mobile app).
Seeing as the VC free money for tech startups pipeline has been turned off and selling something to dethrone an existing large social media site has never been that popular to begin with even when the money was freely flowing I don't think he can count on getting investors to just pay for an ad-less, subscription-less, free site endeavor.
Just a reminder some of the "Marxists" there are of the CIA-compatible variety. Vulgar views, abuse of standard Marxist/AES positions (especially around sex work, they call those who uphold the Marxist position SWERFs).
Not awful but not free from problems either. Can mostly be ignored but I foresee struggle sessions in our future on certain issues. Certainly rather federate with them over any of the other instances but I hope our mods have their banhammers ready and we have our downvotes handy because they have some BAD takes.