He seems burned out over trying to keep up with the fast pace of AI development (which is understandable). He's clearly putting inhuman amounts of effort into whatever he's doing and it's wrecking him, so I'm guessing he's perceiving questions about his project's longevity because he hasn't addressed issues from six months ago as seeing vultures circling in anticipation of his imminent demise. He's giving it his all and he's being presumed dead after six months...what more can he give?

That's all totally ok and understandable, and I hope he takes some time off to relax in the next few weeks. But I also wish that he would take this article down. He's externalized his own internal struggle as authoritative-sounding advice proscribed to the community at large, based on his own misguided perceptions of perfectly-acceptable discourse. It's Toxic-with-a-capital-T.