Carmack is a full time AI developer. He's working on AI in the most hardcore sense: aiming at full AGI. I've DM'ed with him for months about it. I was skeptical, and then his ideas turned out to be some of the most innovative I've seen.
When Carmack tweets something, it's because he believes what he's saying is true.
Searching for the most charitable interpretation of your argument, the only thing I can think of is "Maybe Carmack's view was contaminated by his time spent as CTO of Oculus." But he joined Oculus long before Facebook acquired it, and before the policies you mention. Carmack may be legendary, but he likely had no say in those policies.
He's still simultaneously the CTO of Facebook's Oculus division, which runs their 30% app store and is building the Roblox-aesthetic Facebook Horizon "metaverse":
When Carmack tweets something, it's because he believes what he's saying is true.
Searching for the most charitable interpretation of your argument, the only thing I can think of is "Maybe Carmack's view was contaminated by his time spent as CTO of Oculus." But he joined Oculus long before Facebook acquired it, and before the policies you mention. Carmack may be legendary, but he likely had no say in those policies.