Unlikely, as the hotspot sensors/detection logic is baked into the chip silicon and it's microcode. AIB's can only change the PCB around the die. I'd almost guarantee the thermal sensors are still present to avoid fires, but if Nvidia has turned off external reporting outside the chip itself (beyond telling the driver that thermal limit has been reached), I doubt AIB's are going to be able to crack it too.

Also the way Nvidia operates, if an AIB deviates from Nvidia's mandatory process, they'll get black balled and put out of business. So they won't. Daddy Jensen knows best!