I think the point being made is how this is different from stay-at-home parents? I would also add another example: home-bound elderly or disabled people? Is it acceptable to charge those categories a different rate, given the reasoning being applied is simply “being home more”?

I'm afraid I don't understand this logic.

Their own logic seems to be - the rent covers all utilities (they have assumed a certain cost for utility based on some logic that assumes the tenant not being at home majority of the time; they're then saying - if you're going to spend more time at home, we assume you're going to go over our utility estimate).

Also, it's a 1 bedroom and they have a target renter in mind. Maybe they aren't expecting (planning) to rent to elderly folks or disabled people; Maybe their target is a working professional.