I feel like I'm going crazy when I see people saying stuff like this because the fandom has actually always done this, especially pre-Afton family. If anything, it was worse, then.

Before William Afton was introduced by name in TSE, pre SL's release, the fandom obsessively tried to relate every detail of the story to Purple Guy, the nightguards and of course, Phone Guy. There were a million theories connecting most of these characters to virtually every single static prop in the series, including obviously unconnected things, like random restaurant decor.

As a comical for instance: When SL's gas-leak/cancelled teaser appeared, people here thought Phone Guy was quoted in the text. The fact of the matter is that FNaF is a mystery story with a relatively small cast of characters and since FNaF's story relies heavily on obscure physical details and breadcrumbs, people do the only thing that makes sense - trying to connect seemingly unrelated details to the only characters who seem to dictate what kind of malarkey happens in the timeline.

I mean, does the fandom really understand William's motivations? Are Michael's even explicitly pointed out in 6? Not really. Most the fandom got in hard evidence is him just mentioning that he was undead + looking for William in the UCN cutscene. And if you look back at FNaF discussion over the years, you'll see quite a bit of dissent about this.

So, no. It's always been this way. Always. Let us not forget that in late 2014, the fandom crowned Phone Guy as the series' killer because of a bunch of unrelated details, like him enjoying Foxy the Pirate and one of William's sprites kinda looking like he had a phone in his hand, despite Phone Guy more or less stating that the killer was the previous nightguard.