I'd suggest reading this[1], it's a quick read and paints a slightly different picture, probably still biased as everything is in society in general but you get a different side of the coin regarding Carmack. It's then up to you to decide if you like him more or less :)

[1] https://www.waterstones.com/book/masters-of-doom/david-kushn...

Well he's CTO of Oculus these days, representing the worst business practices the VR industry has to offer. So he can't possibly not be full of shit.

That was my first though too, but recently he did a talk pouring a lot of cold water on VR hype, so he's at least less full of shit than much of the VR crowd: https://arstechnica.com/gaming/2021/10/john-carmack-sounds-a...