Man I feel bad for you, that really sucks, what a PITA.
But I do think this is totally different from the accidental putting the car into TACC in a car park situation.
I think the problem is creep mode, I don't use it and don't like it, I come from manuals and the auto's creeping forward always felt strange to me, I'm glad I can turn it off on my Model 3.
I think the problem could be that creep mode was pulling the car forward, you had your foot on the brake, then you needed some extra juice to get over the bump, moved foot to accelerator, then it's just a small mental switch to think your foot is still on the brake and as you try to stop the car it just goes faster and faster.
I think the takeaway from this is that one foot driving (regen braking) and creep mode don't go together, too easy to think your foot is still braking when it's creeping forward or slowing down with regen, without creep on the accelerator and brake are more mentally compartmentalized with a direct feedback loop - creep mode breaks this feedback loop and I think probably leads to these accidents.