I'm suspicious. This does not seem quite like reality:
The MECH said Radiator fluid was leaking through the seals causing electrolysis.
What seals? And how would that cause electrolysis? And why would that lead to TWO new motors under warranty? Methinks he is trolling with irony?
Perhaps the headgaskets failed DUE to prefailure electrolysis due to failure to change coolant regularly, but that would hardly be warranty. I could be missing something.