I'm not claiming he is mainly motivated by this but it's a fact that his life work will become moot over the next few years as all programming languages become redundant - at least as a healthy multiplicity of approaches as present, it's quite possible at least a subconscious factor in his resentment.

I expect this to be an unpopular opinion but take no pleasure in noting that - I've coded since being a kid but that era is nearly over.

For those of us who consider programming a way to self-realize, the potential vanishing of programming as a lucrative job definitely seems threatening. However, I don't think it could disappear entirely. Professions replaced by machinery, at a global scale, continue to thrive locally, at small scales; they can be profitable and fulfilling for the providers, and they are sought after by a small (niche?) target group.

In other words, I don't need programming to remain mainstream, for it to continue fulfilling me and sustaining me.

Not sure about this, AI hasn’t managed to build software on a medium scale or larger.