Bellular is probably more hopeful for WoW than the vast majority of content creators. He's also the most realistic and most constructive about it. He's looking to fix the shit hole state that it's in now through open dialog and discussion, as well as criticism of areas that greatly need improving.
You can see him as negative, I see him as the most based and positive individual who isn't huffing copium that still wants WoW to succeed. He states multiple times in all his WoW videos that he hopes WoW improves and succeeds. Some people want WoW to continue down the path of ruin because they believe in every decision Blizzard makes. Others gave up giving constructive criticism years ago because they know Blizzard doesn't give a fuck.
And as I said, just because you hate his opinions and conclusions on some things doesn't make the statistics in the video wrong.
Shadowlands was lauded as being better than BFA, and yet has seen a sharper drop off in nearly every single metric in terms of player engagement. Not just in percentages but in raw numbers as well.
That you think this is merely about "reinforcing hatred for WoW" shows just how fast you're ready to write off any kind of criticism. Of course, you never actually add anything to a conversation. Because that's why you're here. Not for any kind of constructive conversation,
but to paint everyone as a hater whose opinion is invalid because they dared to speak poorly about WoW.