How will they know if you're using AI or not?

I would say as a developer you absolutely need to be comfortable using the tools and understanding the possibilities but how much you use it should be up to you within any token / licensing limits.

I remember back in the 90s when people were starting to use IDEs and other developers would use vi or emacs for everything. There was always a suspicion that each camp wasn't doing it properly! Management didn't care as long as the work got done.