Did never hear the word Solarpunk. But great to see punks advancing.
Defnitly has lot of core communist ideas. But I think it is important to see, that a direct democratic communism or federatad communal utopia does not have to lead to authoritarian regimes.

But I also do not beleave, that any extreme philosophy is great in bringing peace of minde to society and feed them well. I think it is rather the ongoing discussion between pure capitalism and rules to prohibit expoitation, that leads societies to chance equality and wealth.