Yes, well, he said a lot of things while on heroin.

Writers say all kinds of wack shit. Some of it sticks, some of it doesn't. This one's not really relevant to the OP's question.

The Wikipedia page expresses it fairly clearly in the intro paragraph:

Solarpunk is a literary, artistic, and social movement, closely related to the hopepunk movement, that envisions and works toward actualizing a sustainable future interconnected with nature and community. The "solar" represents solar energy as a renewable energy source and an optimistic vision of the future that rejects climate doomerism, while the "punk" refers to do it yourself and the countercultural, post-capitalist, and sometimes decolonial aspects of creating such a future.

Oh wait, punks are supposed to kick the ass (or the balls) of the ones in power ? Like the Cockroach Party ?

https://feddit.online/c/news_from_the_subcontinent

I tried.

Uh, categorizing self-absorbed hippies as punks is about as wrong as it gets 😅

It's not about the lable, its just a shortcut to explain a common cause and idea how to interact with one another.

Punks hated hippies. To punks, hippies were privileged kids that could always go home and get bailed out. Punks were treated like scum and fought for what they believed in.

Hippies look friendly on the outside, but are rotten and nasty at their core.

Punks look rotten and nasty on the outside, and are friendly at their core.

In solarpunk just like steampunk and cyberpunk I don't think the punk park hold much meaning.

It is similar to porn in unixporn or foodporn. It just signals that whatever you are talking about is alao an aesthetic.

Categorizing the hippies as a kind of punk ruined my day tho.