What I got from the guidelines and the legislation was that if all caregivers in the household were incapable of providing care, another person, from another household, was allowed to visit and provide care. Not that you could leave home to do so.
And as I have said, on MN, this interpretation was seen as a bit lax in some quarters. Anyone else remember a thread about whether it was acceptable to take care of a friend's child so that she could have her husband with her as a birth partner in hospital?