Again, what is the repression of the Kingdom of Spain exactly? Not allowing the referendum? It was ruled illegal by the high courts. Catalonia should push for a change of that, but not blame the government for applying the Constitution.
Denying people a right that's commonly understood to be fundamental to international law and then using violence to enforce it is repression in my book. Spain has consistently escalated tensions rather than offering a path to a real democratic decision. They're going to have to accept the repercussions of that decision.
Most importantly: the referendum is illegal even by the autonomic law of Catalonia. They should have had 2/3 of the chamber to push it, and they did it with less than half (48% IRCC).