While I also find the blanket "cryptofascist" moniker a bit oversimplifying, cottage-core as an online phenomenon seems to lack a lets call it "natural immune response" to far-right people infiltrating their spaces and and appropriating the aesthetics. The Esoterics community (in Europe at least) has a very similar problem with right-wing people infiltrating online and offline communities via vaccine skepticism and then slowly move things towards the "sovereign citizen" movement or similar.

If I would draw a parallel to Solarpunk, it would be corporate green-washing attempts, which are happening, but the same time are widely discussed and actively fought against.

Maybe it lies in the very nature of the people typically drawn to Cottagecore and similar ideas, but I have not seen much of an similar active rejection of right-wing appropriation attempts, but rather some people retreating into their private spaces. Ultimately this has lead to the cottagecore to tradwife propaganda pipeline that sadly seems to exist these days.