Okay? Points still stand: It’s written as an authoritative exploration of a social scene extrapolated from a few days visiting a place and attending one party.
If someone’s writing in journalistic style I think it’s fair to criticize it as journalism, even if it’s on Substack
I read the entire post and it isn't, at all. It's a personal story with his own reflections on a scene as he experienced it. It's no different than literally any other blog post or journal entry, and at no point does it claim to be a neutral sociological study.
It is not presented as authoritative anything, except perhaps one person's experience. And we should assume it is embellished.
You are taking this far too seriously. It is a vignette which captures the flavor of a place at a particular time. And it is delightfully written.