He won't answer, he has not been back since May of 2021- he got his answer and left, he did not intend to be part of the community, he was just here to use us. A great number of people never come back to tell us what was wrong, they simply move on and life their life - commonly, they also never really think about what they have learned and therefore don't really learn much from the experience.

I'd bet money it was the RCM. Note that he vanished as soon as the RCM was mentioned.

See, if the 12 volt feed from the RCM that feeds the brake controller fails, you have:
Power brakes, but no ESC.
Power brakes, but no BAS.
No data from the brake controller to drive the speedometer.
No data from the brake controller to tell the BCM the car's speed (so the wing defaults to UP just in case you want to go 145mph).

Pretty simple, as soon as I saw what his FULL symptoms were, it was obvious. Go ahead, try pulling the brake controller fuse on the RCM and try driving the car.