i've been thinking about this for so long and i don't know why i've never made a post about it, but did we ever come to a general consensus on what these were?
i never really saw anyone talk about it, or maybe i just missed it all somehow? but i am of the FIRM belief that they're the mogma from skyward sword
the statues don't resemble the zonai nor do they resemble any other race present in this, or any other non-skyward sword version of hyrule. wether you think the zonai era of totk displayed a refounding of hyrule or that this is in another timeline completely, it doesn't matter cuz this is zelda and they never give shit to you straight anyway.
my running theory is that the mogma existed in hyrule during the zonai's reign, maybe even aided in excavating the depths and installing the mines? they are a subterranean people afterall. they definitely would have had to have been of enough aid, or been important allies, to the crown for these statues to be built, but they died out, were killed, or fled, either before or during this era's imprisoning war.
this game majorly fucks up the timelines, so i feel like it isn't too far off to say that they could have been lurking under hyrule for centuries, completely unbothered by hyrulean life, because we never got ANY proof that the mogma died out after skyward sword. the parella evolved into the zora, the kikwi evolved into kokiri and koroks, the gorons are relatively unchanged (rip to the lanayru robots tho, unless they were sheikah tech – but that's for another post), but narry a whisper about the mogma.
does this make sense? do i have proof? no, it does not and no, i do not
do i buy it? yes i fucking do