And he's uspet that it didn't pan out, and he's quite clear on a fairly reasonable, if hyperbolic, explanation of why the ideas didn't work.
I read it as him coming to grips with the common blind spot of "my ideology would work just fine except for all the people who don't hold my ideology". You hear it from proponents of all major ideologies; liberalism "they're on the wrong side of history", conservatism "what happened to common sense?!" and libertarianism "but in a libertarian society..."
His stuff is ranty and tone-deaf, and he probably shouldn't include it on a page on set theory, but he's not delusional.