These articles mostly just seem like they're looking for a reason to shit on the show based on canon rather than actual quality.
A single line from Obi-Wan in RotJ decades after Mustafar, long after he learned Vader had survived it even going by this new show, is not substantial proof that he knew all along. Especially in the context of a conversation with Luke about his family, where it'd make more sense to make it about his father, even if that were a distortion of their original motivations. Okay, sure, the intent at the time was not explicitly to hide them from Vader, but with the later revelation that Vader was alive, hiding them from the Emperor implies hiding them from Vader, so it works out exactly the same. And unlike the previous misleading wordings Obi-Wan had used with Luke when talking about his family, that's not a deception; that's just the normal way one would say it to simplify the matter and keep it relevant to the situation.
And besides, even if the line did
prove he knew, contradicting a distant line like that is the mildest of retcons, and one which, if the show were good, would be entirely worth it. There is no genuine complaint to be had here.
>Does he know the moniker Vader? What would that mean? Can he associate the two? What was he cognizant of? How isolated is he? Where’s Vader at that time? Where’s his reputation and how well known is he?
This is reasonable brainstorming. If I worked on the show I'd ask the same question out of diligence. I really have to wonder how many people reading this article and agreeing with its reaction, having a gut feeling of "yeah, of course he knew, right?", still needed to be reminded that the security footage scene was where it was proven. Assumptions like that are exactly the sort of thing someone working on the show is supposed to second-guess.
The question was asked, it was answered, so both sides did the job they needed to do in that regard.
This just seems like outrage-baiting to draw in dissatisfied fans without needing the effort of forming arguments of substance (and, perhaps, to give an angle that lets them avoid political criticisms of the show).