And in-game perspectives, as well as character opinions, are also canon. I'm not making anything more than what it was. In the case of Chronicle, there was a change from reference material to Titan-based PoV in terms of the objectivity of the books, but they were and remain fully canon to the Warcraft universe. What doesn't matter, however, is your take on Blizzard writing being "meme-worthy" or whatever else - as I said before, your subjective distaste doesn't alter the nature of what canon is for a given IP. Even before Chronicle was clarified as PoV-based, it still wasn't the end-all and be-all authority on WoW lore, either. It left such things as the nature of the Shadowlands as well as the Emerald Dream open to speculation and conjecture. If anything, it's a handy timeline of the story of Warcraft, and being based on the PoV of the Titans doesn't change that.
TL;DR: You don't determine what is canon, and neither do I for that matter. Canon is determined by which sources Blizzard endorses and authorizes as such. No one else gets a say on the matter.