It's questionable that it's not literally just a fan theory. For years fans were trying to put the Zelda games on a single timeline, and Nintendo just didn't care. The split timeline was one of the top theories of how everything can be put together, based off of a single developer comment that implied a 2 way split instead of a 3 way split: https://zelda-archive.fandom.com/wiki/Split_Timeline

Then Hyrule Hostoria came out as a collectable. I would put good money on a conversation during its writing that went like this "What else can we put in here?" "Maybe a timeline of the games?" "Yeah, sure. What's the official one?" "There isn't one. The fans have a fun split timeline one." "Oh neat. Yeah work out the details. Now has anyone found that Wind Waker concept art yet?"

A common flaw I see in media literacy is operating like the author has pulled a completely coherent story from a different universe and simply written it down, as opposed to a creative process. Nintendo has never cared about the timeline, nor developing a single coherent story across all of the Zelda games. Some games are sequals, prequels, or have direct references. The timeline itself is purely from non-game sources, and is obviously not a factor when they design a new game.