What I find baffling as well is how casually people use 'whiteness' as if it was an intellectually valid concept. What does one expect to receive when asking for a picture of a white women ? A Swedish blonde ? Irish red-head ? A French brunette ? A Southern Italian ? A Lebanese ? An Irianian ? A Berber ? A Morrocan ? A Russian ? A Palestinian, A Greek, A Turk, An Arab ? Can anyone tell who of those is white or not an…
You might quibble with a few of them but you might also (classic example) quibble over the exact definition of "chair". Just because it's a hairy complicated subjective term subject to social and policital dynamics does not make it entirely meaningless. And the difficulty of drawing an exact line between two things does not mean that they are the same. Image generation based on prompts is so super fuzzy and rife with multiple-interpretability that I don't see why the concept of "whiteness" would present any special difficulty.
I offer my sincere apologies that this reply is probably a bit tasteless, but I firmly believe the fact that any possible counterargument can only be tasteless should not lead to accepting any proposition.