It's imperative to understand that non-internationalist worker movements that don't care about imperialism are the actual bourgeois concessions that you mentioned earlier.

Certainly, but the left wing of the Labor party and the Communist Party in France were the ones to advocate for and eventually succeed in gaining decolonization, instead of endless campaigns of repression.

Excuse me, which demsoc movements have control in the so-called "democratic world"?

Lula in Brazil, Luis Arce in Bolivia, Claudia Sheinbaum in Mexico, and Gabriel Boric in Chile to name a few.

Speaking of Cuba, I bring another source: a book by Pedro Ross called "how the worker's parliaments saved the cuban revolution

I'll have to read it, I've been meaning to do more research on Cuba.

Anyhow, how's your statement that as soon as they have multi-party systems you'll consider them successful, consistent with your claim that you measure success on the material conditions of the working class?

I believe the main abuses of the Communist parties were caused by their complete control over power with no recourse. When the party became repressive, the leaders/bureaucrats making the decisions couldn't be voted out, not even by average party members. I also just thoroughly have an issue with the party dictating to the working class what it's priorities are, and not the reverse. I'm not arguing they'd even have to start having multi-party elections, but at least have multiple people within the part contest the same seat in the politburo/central committee/legislature, argue for separate sets of ideas or plans (that adhere to party ideology), and let the party members decide which should be deciding the future of the party and country. That'd be enough for me, currently I see the political selection process in communist states to be controlled from above, usually by the highest organs of power, such as the Organization Department of the Chinese Communist Party, which controls the party and state bureaucracy, and the Politburo, which controls the process in China.