I have had poor reloads fail to chamber in my Glock. The striker hit the primer, but the gun did not fire. I have seen this dozens of times. The bullet would not chamber by a fraction of a millimeter and it would not fire out of battery.
I had a guide rod, aftermarket, that would slip out of battery when I fired. Sometimes the gun would not fire, if it slipped out of battery. It would light primer strike but not enough to fire. Sometimes it would not quite slip out of battery and would fire. This was a .40 caliber with high pressure loads. The gun never blew up even with that shoddy aftermarket recoil spring and that hot loads. I fired about a case of ammo like this. When the gun did slip out of battery, it did not fire.
My conclusion is, that if the gun does indeed fire out of battery, I must have experienced it many times, and it never blew up.
On the other hand, when the gun really was out of battery by even a fraction of a millimeter, it would not fire, so maybe the gun really cannot fire out of battery.
I have heard that all guns can fire a little out of battery so it is a non issue.
Anyway, from that experience, I cannot see how out-of-battery discharge can be blamed.
The only case of Glocks exploding have been overpressure reloads, or bad factory ammo where the factory took the blame. Glocks blow up often, because there are a LOT of Glocks out there and the rumors run wild. When a 1911 blows up, it is just another bad reload. When a Glock blows up, it is a "bad gun design".
I have seen revolvers blow up, Sigs and others, but never a Glock.