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For context, Spain is a full constitutional democracy, subject to the jurisdiction of the European Court of Human Rights, with a free(ish) press, independent judiciary, and regular elections — none of which Assemblea itself disputes, because it participates in all of them. The events OP is referencing (the 2017 independence referendum aftermath) were reviewed by European courts, and the outcomes were, shall we say, not quite the narrative Assemblea sells on its website.
If there are genuine, documented human rights concerns, I'd welcome impartial sources from the Supreme Court or the ECHR.
What I'd push back on is treating a political lobby's own press releases as neutral reporting. You should do better than that here, OP.
https://www.ohchr.org/en/press-releases/2022/08/spain-violat...
(why? Let's be honest: Catalunya would benefit enormously from independence, but when the economy goes well, as it did from 2001-2007, they're fine. After that the situation worsened again. The situation is simple: Catalunya has a much better economy than Spain and could maintain government spending, whereas being part of Spain, they need to cut social spending)
The Spanish government has violently repressed this, attacked the people, arrested politicians, tried to threaten other EU nations with invasion (yes, seriously, the current government has a few "rough edges", even if I would agree if someone said that any other party would be worse) unless they arrest Catalunya politicians (then did nothing when they told them to go f themselves), and this mostly with the agreement of regular Spaniards.
Given what is happening in the EU (10+ years of slowly but unrelentingly worsening economy) the situation is slowly worsening again.
I agree the Rajoy government's handling of this was very problematic, but the rest of this isn't really accurate. And the morals of the economy argument is terrible - the rest of the country needs us, so we should cut them off? The same argument would apply for Barcelona cutting off the rest of Catalunya. It's not a good direction.
Spain quietly drops probe into “Russian meddling” in Catalan referendum: https://www.wsws.org/en/articles/2021/06/21/cata-j21.html
Oh and both are pro-China too. I guess they're trying to open the next huge can of worms preemptively. Why wait?
So, yeah, I doubt Ukraine is happy with either side in this conflict, and Catalunya separatists are a somewhat more desperate than Madrid. Doesn't really change anything about the conflict.