Moravec's quantum immortality via quantum suicide/many worlds doesn't work because there many-worlds doesn't exist. Reasoning can be found in Doug Matzke's Deep Reality. The phrase quantum immortality leads to Moravec's inane postulate so I'll have to decide on another label for my position. Maybe T-Field Immortality or Thought-field immortality. TFI. We are our T-field so it's the entity that is immortal. The T-field is in the quantum realm.

https://interestingengineering.com/science/a-theory-of-quantum-mechanics-that-suggests-everyone-is-immortal