The experience mainly left me with a sober respect for Groucho Marx's about not joining clubs that would have me as a member.
Where's the equivalent place of today? The answer is necessarily murky and elusive. When a club gets famous for being the place where all the cool people hang out, it quickly ceases to be that kind of place. Cool places have to filter for the ability/connections to find them.
What happened is that the internet changed and fandom changed, and also trends in philosophy for young lonely nerds shifted away from that particular brand of rationality, to places both sunnier and darker. I think if you want to find spaces like that you now have to look either in closed Discord server or more likely offline. Substack certainly does not provide the same kind of community.