Let me preface this by saying I am a White male from Canada so my perspective is not necessarily needed for this conversation.
I have seen this argument/accusation of colourism labeled against the show since the first casting reveal but I don't really see it from my POV.
This season the complaints largely seem to be about PoC are being more brutally killed than their white counter parts. The White BA sister during the BA attack in episode 1, head beaten with Leane's Staff, Ispan's death by Moggy in episode 6, thumbs pressed through the face in Tar, and now Valda in episode 7, burned to death.
Now historically I think the 2 most gruesome deaths in the series belong to Laila in season 1 and Uno in season 2. And for this season which is more brutal, the White being beaten by Leane or the Brown sister who was cut in half a minute earlier? Is Valda's death worse than Natti Cauthons? Valda we mostly see CGI flames, with Natti we see 2 close ups of her charred corpse in 2 different episodes. Are these intentional or subjective?
In season 1 the complaints were that the darker skinned characters were cast as villians, Valda and Padan Fain. Didn't matter that 3 of the e5 were coloured because they were too light skinned. Expect when it did matter that they cast the black man as the who killed their wife. But would it have been better to cast them as Mat, the local thief and troublemaker who betrays their friends? But also ignoring Hammed cast as Loial.
I don't really know the answer to any of this. Are these choices intentional or the fault of casting a very diverse cast? I know there have been rumblings of an uproar if they do kill off Moraine and Suian this season as that just reinforces the bury your gays trope. This ignoring all the positive rep show to the LGBTQ community in other couples.
I just dunno.