It's probably true knowing apple. I already had someone talk directly with driver guys at apple about the missing hardware and they were genuinely indifferent to it. They didn't act like they were changing that any time soon. I kinda expected their stance on 6700 already not to change if they have no intent to sell/use them in their mac pro refresh plans, but I had hoped they'd bend on the missing Ids for 6900XT gpus but i don't even think that's gonna happen.
I'm gonna need to find a way to modify my cards bios with diff Ids vs replacing it with an inferior cards bios that will lower clocks. That defeats paying for a high end custom silicon card iwth massive overclock in first place. There has to be a way to keep that performance because if I have to drop to a weaker bios i literally paid extra for a performance boost for absolutely nothing :\