This is, uh.....not very reassuring.
Only possible fault I can find is that he charged his Bolt in his garage. I believe GM recommended it should be charged outside, but not sure if that guidance was only for Bolts that didn't have the fix applied or was general guidance for all Bolts affected by the recall, fix or not.This sounds like there was no neglagence on the part of the owner.
I'm assuming that guidance will be changing shortly.GM's recommendation is only to charge outside if you cannot set the reduced charge limit, or until you have the temporary fix applied.