The MBPs didn’t run too hot, the Nvidia GPUs used an underfill that stopped providing structural support at a relatively normal temperature for GPUs (60-80 degrees C).
GPU failures due to this also happened on Dell/HP/Sony laptops, some desktop models, as well as early models of the PS3.
I imagined the convo between Steve Jobs and Jensen Huang went like this:
S: your GPU is shit
J: your thermal design is shit
S: f u
J: f u too
Apple is the kind of company that hold a grudge for a very long time, their relationships with suppliers are very one way, their way or the highway.