Here’s Balenciaga’s 2023 video showing off their styles for the year. This is from their own YouTube channel. Fair warning: the children shown appear to be dolls, not actual human children, but it is still disturbing: https://youtu.be/Yh_1K9s6UV0 These seem to be adults dressed as literal demons (one of them has horns on their head) many of whom are carrying (probably fake) children, and all marching through the mud.…
The "theme" (insofar as anything high fashion really has a theme) seems like a mixture of grindhouse and apocalypse. "Child carrying a doll" is a borderline trope in that context: compare, for example, the first episode of The Walking Dead.
I don't know anything about the thing you haven't linked, because you haven't linked it. But the panic over this video doesn't pass the sniff test.