When I use AI to write code, after a week or 2, if I go back to the written code I have a hard time catching up. When I write code by myself I always just look at it and I understand what I did.
you can also read human code and empathise what were they thinking while writing it
AI code is not for humans, it is just a stream of tokens that do something, you need to build skills to empirically verify that it does what you think it does, but it is pointless to "reason" about it.