Calling liminalism the "defining" aesthetic of our time is a bit much (though I get the article is trying to hitch its wagon to the Backrooms, aka the "current popular thing"). It's an aesthetic microniche, about as popular as vaporwave, or cyberpunk, grunge, or Y2K (think flip phones, bulky plastic cameras, etc.). There's a ton of these, and some are surprising: for example, there's even been a relatively recent revival of the "old-money" aesthetic, especially motivated by fashion brands like Rowing Blazers, etc.

Interesting article, but calling it THE defining aesthetic of our time feels a bit sensational.

Ive always felt that the Art World seems to talk in its own tone. And that tone is arrogant, looking down on people, and haughtiness. Words dont mean with the Art World as they normally do. And definitions are scarce, since you are expected to innately know them, or be 'out'.