This article is all hypothesis and no evidence.

Yes, it's clear that if AI agents handle routine issues then only the most complex issues will be handled by humans. In no way does it follow that humans will be less prepared to handle those incidents than they are now; by definition, this class of problems have no rote solutions. Each issue of this type already requires deep system knowledge to remediate, and still will.

What we are seeing here is an instance of the more general trend where experts are still required to operate complex systems, but AI is destroying the career path that creates those experts. That's what we should be worrying about, not that people are going to be spending less time rebooting boxes. This isn't something you can fix with a "simulator."