I get it, he's legendary for the work he did at id software. But this is the guy who only like 5 years ago was convinced that static analysis was actually a good thing for code.
He seems to have a perpetual view on the state of software. Interpreted stuff is slow, networks are slow, databases are slow. Everyone is working with Pentium 1s and 2MB of ram.
None of these are what he thinks they are. CPUs are wicked fast. Interpreted languages are now within a single digit multiple of natively compiled languages. Ram is cheap and plentiful. Databases and networks are insanely fast.
Good on him for sharing his takes, but really, he shouldn't be considered a "thought leader". I've noticed his takes have been outdated for over a decade.
I'm sure he's a nice guy, but I believe he's fallen into a trap that many older devs do. He's overestimating what the costs of things are because his mental model of computing is dated.