Computer output cannot be copyrighted, don't focus on it being "AI". It's not quite so simple, there's some nuance about how much human input is required. We'll likely see something about that at some point in court. The frustrating thing is that a lot of this boils down to just speculation until it goes to court.

i made a script years ago that algorithmically generates python code from user input. Is it now considered AI-generated too?

No, because you created the generation algorithm. Any code it generates is yours.

OP is obviously ignorant of how much tooling has already helped write boiler plate code.

Besides AI code is actually one of the things that’s harder to detect, compared to prose.

And all that said, AI is doing an amazing job writing a lot of the boilerplate TDD tests etc. To pretend otherwise is to ignore facts.

AI can actually write great code, but it needs an incredibly amount of tests wrapped around and a strict architecture that it’s forced to stick to. Yes, it’s far too happy sprinkling magic constants and repeat code, so it needs a considerable amount of support to clean that up … but it’s still vastly faster to write good code with an AI held on a short leash than it is to write good code by hand.

Uh, yes, that's what they call a generative ai