Again, Soviet sci-fi aesthetic is itself a part of a broader Soviet aesthetic. It's not an independent standalone movement that aims to differentiate itself from the rest of Soviet art.

i would largely say it is eco-socialism’s counterpart to soviet sci-fi, it imagines the world eco-socialism would create, working to inspire eco-socialists as soviet sci-fi inspired the soviets

And that's fine framed that way. If you see solar-punk as a component of a broader movement I generally agree with you. I think fleshing out the imagery to be more grounded would be worthwhile, but the broader eco-socialist framework would provide the missing context here.