This reads like an OTA to the infotainment that messed up powertrain somehow. Plenty of manufacturers successfully OTA powertrain these days by using A/B flashing (the B flash programs while the car drives, next key cycle swaps to B and flashes A in background, next key cycle back to A, done).

My suspicion is that this was either a CAN saturation issue (ie - infotainment started sending a high priority message which could reach powertrain CAN) or a state management issue (ie - infotainment sent a “put modules to sleep” or “wake modules” message which was not handled correctly and caused one or more modules to transition to an invalid state for driving).