This feels like a definition question.
Like, I don’t think “is morality absolute” is a question you could resolve via the scientific method.
I don’t believe there is any experimental result that would convince me “oh, morality is / is not absolute.”
Subscribing to any form of subjective morality must be classified as motivated thinking, which is not sufficient to prove that it is wrong, but is sufficient reason to mandate skepticism with respect to this conclusion.
todo maybe I’m wrong here, and maybe I should play taboo to figure out what I actually mean here