Sorry for skipping over your actual argument, but if it hinges on that assumption then it's probably moot. I'd assume almost all ai generated code that makes it into codebases is produced using a harness.
if it uses a harness, the effect is still there, just piled on and magnified.
I sometimes gen code without a harness and copy paste it or manually type it, maybe I can do like 200 lines in a day? Whenever I see someone coding with a harness it's like 100x times that, so this phenomenon will happen hundreds times more.
Sorry for skipping over your actual argument, but if it hinges on that assumption then it's probably moot. I'd assume almost all ai generated code that makes it into codebases is produced using a harness.