The rules specify "media", but should reasonably be expected to extend to code, though unless you release source code and it's obviously got some comments that sound like AI, we don't really have any way to know - as opposed to images/text/music which if you are familiar enough with tone and things to look out for you can clock it.
It's mainly an honesty-box system where we would really prefer you didn't, but we can't exactly stop you from generating AI code and passing it off as your own. Beyond that, AI doesn't generally understand your project and so while you can generate code if you want to, you still have to consider a lot of other things like how it all fits together, code optimisation, setting up your project, etc. You also have to be able enough with code to assess if what it generates even works for you. It isn't feasible to give all of your project's code to the AI each time and it tends to be fairly mid with debugging and code generation, especially if you're trying to do something advanced. With images and text, you can just slap that in wholesale if you want, so it's easier to moderate because it tends to be fairly obvious.
All that said, I'm glad you are choosing to make a game that plays to your strengths rather than relying on AI as a crutch.