Again that's the bias, you have the previous knowledge. It can rust, but its doesn't as much to maintain it.
The same can't be said for someone who is still learning or doesn't have that knowledge ingrained yet.
Discussion
Ok, we can partially agree on that. Taking shortcuts is not a good way to learn anything. That's the only downside if it.
But just consider that most of those people who are now able to code, or do anything else, relying on AI, would have not even dare to approach those matters without it. They just get a job done that previously they could not. They were not interested in learning about that before, so they are not missing thinking abilities, and conversely they are acquiring new skills.