I haven’t watched Wakanda Forever, but I am going to guess it is accused of being woke because it probably tries to push a political message or ideology and doesn’t do a very good job of weaving it into the story (very common for modern Disney). Looking at some of the complaints, it appears to have a similar problem to other modern Disney films, in which women are put on an elevated pedestal and men are left to be bumbling idiots completely incapable of basic human functions. This is the most common complaint I see in the reviews, but I don’t see any specific complaints that every character is black. I’m sure its possible some people might complain about it, though I doubt it is a significant portion of the complaints if I haven’t seen it mentioned in the 100 or so reviews I quickly skimmed through.
I did watch Black Panther, but I don’t remember much about it. I remember the bad looking CG, and there being some points where I felt modern Disney’s political messaging was poorly written and “too obviously preaching to the audience,” for a lack of a better way to put it. Not because all the characters were black in the story that literally takes place in Africa. I do recall noticing that Disney chose only white actors to play all the villain roles in Black Panther, which normally wouldn’t have been a problem but in the context of modern Disney and when you have all the black people as “the good guys” and all the white people as “the bad guys,” that is probably going to be taken by a lot of people as political messaging. I didn’t have any issues with Chadwick, he was a good actor for the role of Black Panther IMO. I was sad to hear about his passing. I don’t recall being particularly irked by any other character than that one girl that was his science assistant (I think, I dont remember fully), but I also only watched the movie once in theaters when it came out. So it has been a while.
That’s not to say people are incapable of being racist, but most of the time something isn’t called woke only because the entire cast is black, unless the story was supposed to have white characters that are suddenly black instead (like the live action Little Mermaid, for example). It needs some other context to be called woke other than just “the whole cast is black.”