I feel ya. Kotaku does have tons of problems, I am not going to bat for 'em or anything.
It's just not how it works. There's more to it than that - namely similar information is coming from other sources, and also there's been accuracy among the inaccuracies among some reports that come from less reputable sources.
I can't speak on irrelevant crap like Diablo IV being darker or whatever, but the rest of it? The mismanagement and the corporate stress aspect? It sounds completely on point with the showing Blizzard's given lately. There's been PLENTY about how Activision has been pushing harder, including from former Blizzard themselves. There's also just a general trend of how big mergers like this start to hurt the soul of smaller companies.
The "Geek Is" crap from Metzen several Blizzcons ago felt transparently "we're sorry we signed the Faustian bargain, here, have some nerd references." This shit was a long time coming, and as much as people suck off Wrath, that's where it started. Heavily casualized to a new degree, a tier with reused content and only 2 new encounters, only one challenging one (Sarth+3), the whole Trial of the Crusader, more emphasis on dailies for player progression, etc. One good raid in the form of Ulduar doesn't devalue that it was a trend in how the game functioned.
It's been a long time coming, and I find it humorous people use a mobile game as the breaking point when the writing has been on the wall for almost a decade. On the topic of games journalism, it's as bad as when people ignored shit like Jeff Gerstmann getting fired from Gamespot but got all up in arms over Zoe Quinn's personal crap. People get up in arms over the lamest crap.
Immortal is a travesty, but I'm shocked people are going to bat over that and not...the entire fucking corporate trend of Blizzard up to now.
EDIT: Super late edit, but also around this involvement time - increased focus on mictrotransactions for a game that is sub based involving blatantly removed or repurposed content. Yes, I'm sure that star pony totally wasn't a mount drop off the boss made of stars in the same tier release time period. Heart of the Aspects both appears in the Mythic Deathwing encounter and has flavor text referring to it...and is a store mount. Instead, you get an Alex Drake Recolor.
IDK why people act as if it's somehow strange that the increased corporate shilling and stranglehold of Activision is a strange idea.