Do they?
With AI agents, I work less, not more. The difference is it's off the books. On paper I seem to work the same but not in practice. I've gone from 40 hour work weeks to maybe 2 or 3 hours a day pushing some prompts. Someday, it might be 2 or 3 hours a week.
That only works until they realize what's going on. Then you will be expected to output so much that you will have to prompt for 40 hours a week.