Here a quote from Thaddeus Howze's answer
As long as there is a single cell (I suppose it needs a nucleus and cellular data to engage his supercharged cellular mitosis) return from being nearly obliterated.
Returning from such a state can temporarily erase his memory but those memories return to him over time.
How could his memory return to him? His memories must be stored somewhere, but could it be stored in a single cell???
So, where does his consciousness reside during this time?