Notably missing Doomer Optimists who accept the reality and inevitability of collapse, while viewing it as an opportunity for localist, agrarian communities to rise in the wake.
But Cottage-core is in the aesthetic section, not the pessimist section. I also know quite a few people with this general perspective and I don't think any of them would use that label. (To reference another comment; this seems like a Very Online label)
Ultimately this perspective doesn't neatly fit into any of the pidgeonholes the author has created. This is a problem with trying to categorize large numbers of humans into sequential, unrelated categories.
Anarcho-communism long predates the Doomers and has always had similar framing. It was real popular in the late 60s / early 70s; the world collapsing is something we’ve known about for a very long time but people have to get fantastically wealthy somehow so we keep doing the old thing.
It's popular whenever society seems to be changing too fast and people think "going back to the simple life" is the solution. Not only was it popular now and in the 1960s, but also in the 19th century when people were weirded out by the Industrial Revolution. People like Henry David Thoreau in the US and William Morris in the UK.
Also popular among the Qumran community in ancient Palestine. They viewed civilization as fundamentally corrupt, and were eagerly anticipating an apocalyptic end to it and the coming kingdom of God to restore things to their rightful place. Which included a more agrarian lifestyle, and less of the modern trappings (for the time).
From the article perspective they are in the pessimist section. As they are pessimist avoid improving the current state.