You also have Zelda saying the phrase: "Whether skyward bound, adrift in time, or steeped in the glowing embers of twilight.." in one of BOTW's memories. So the legends of the Link that was present during Twilight Princess/the Child Timeline must've happened for BOTW Zelda to acknowledge those events, right?
I would agree that that is absolutely evidence that points towards the Child Timeline as well, yes, and that scene was the very first thing that suggested a specific timeline placement to me in the game, but others like to dismiss it because after that, while the Champions are talking over her, Zelda also recites lines that reference ALttP and TWW, too. You could also make the argument that the Twilight Realm exists in all timelines, so it’s theoretically possible for some unseen events similar to TP to have occurred on other timelines, just as you could say the same for the ALttP and TWW references on the Child Timeline.
But despite that, only the lines referencing SS, OoT, and TP are presented front and center for the player to fully hear, and listed in timeline order. The ALttP and TWW bits are separated from the others in a later part of the speech, not presented in timeline order, and are audibly obscured by other characters talking over it. To me, that show clear developer intent that the former part of the speech is important for the player to hear, while the latter is nothing more than background speech that isn’t supposed to be fully heard or considered. The way they framed that scene, it immediately calls to mind the Child Timeline for anyone knowledgeable about the Zelda timeline playing the game. They
had to have been aware of how that scene would be taken and intentionally wrote it as such.
It also aligns with the Goron rock carvings exclusively featuring characters from the Child Timeline plus Daruk, with one Goron from TP and two from MM. (As for how and why there are Gorons from Termina depicted in the first place…I don’t know, lol; maybe Link had photos of them on his Pictograph Box that he somehow retained? lol) In this case we even know that the contracted 3D artist who made that rock formation for the game was specifically supplied with those particular Goron models by Nintendo, because the artist posted about it online (I can’t seem to find the original source on that right now, but I’m very sure I saw it before), so that suggests that those specific Gorons were chosen to be depicted for some reason, and like Zelda’s speech, it comes with obviously timeline implications.
That said, I don’t really like to use those two things as main points of evidence much anymore because so many people will just hand-wave them away as meaningless references, but I don’t think those are quite on bar with, say, minor location names and similar things that are obviously just fun references and not indicative of any timeline placement since they often contradict each other. In comparison, Zelda’s speech and the Goron rock carvings are more tangible, notable elements of the game that are given a focus for the player to specifically notice and both align with a single timeline, and, to me, that’s significant and likely implies a deeper meaning behind their inclusions. But a lot of people don’t see it that way, so I would hope that the Ganondorf/Gerudo thing can be more compelling evidence.
Really, I just wish Nintendo would come out and confirm the timeline placement already, lol. Even though I would say there’s much stronger evidence for the Child Timeline than any other, it’s clear at this point that people won’t come to a consensus until it’s officially declared by Nintendo (though even then some people will still reject it as they do with the Zelda timeline in general, lol).