I think it's nearly impossible to "learn" to the same depth when someone else writes the code: it doesn't matter if its your teacher, friend, coworker, or AI writing the code. There absolutely is a difference between having to toil to come up with an answer, fail, fail some more, work through design flaws, then eventually come up with the right answer. You learn a lot in the process.

Versus someone or something giving you the, or even several, correct answers and you picking one. You are given what works. But you don't know why, and you don't know what doesn't work.

Learning from AI coding probably is somewhere between traditional coding and just reading about coding. I'm not sure which one it's closer to though.

However, it may not be necessary to learn to that depth now that AI coding is here. I don't really know.