What if "the thing" is a human and another human validating the output. Is that its own output (= that of a human) or not? Doesn't this apply to LLMs - you do not review the code within the same session that you used to generate the code?
The problem now is that it’s a human using Claude to write the code and another using Claude to review it.
I think a human and an LLM are fundamentally different things, so no. Otherwise you could make the argument that only something extra-terrestrial could validate our work, since LLM's like all machines are also our outputs.