To me, the biggest problem with "proof of human origin" is that "human-created" vs "AI-created" is a false binary. Most art and code I create involves many rounds of interaction between me and models. I suspect most interesting things made this decade will be like this

https://x.com/trentmc0/status/1794333215290982702

Same, and to some extent this has been true for a long time. Compilers create code I can’t predict and at this point couldn’t have written from increasingly high level instructions and abstractions.  Perhaps they aren’t “intelligent” but they’re on the same line of progression.