Has Genshin ever actually confirmed that the floating island is Celestia?

https://preview.redd.it/twrwkclyfk6h1.png?width=1917&format=png&auto=webp&s=09de0dfb413ffab4696b268a4099dce2f2ff0ac0

Has Hoyoverse ever explicitly confirmed that the floating island we see in the sky is Celestia?

I know that's been the community consensus since launch, but now that we've seen the Temple of Time and more of the ancient civilization architecture, I can't help but notice how similar some of the silhouettes and structures look.

Is there any quest, dialogue, item description, developer statement, etc. that directly identifies the visible floating island as Celestia?

Or is it possible we've all been assuming it's Celestia for years when it could be something else entirely?

Genuinely curious if I'm forgetting a piece of lore.