Vacant homes in general, yes. Similar numbers of people have second homes for vacations as are homeless in the US. There are also quite a few abandoned homes in dying rural communities with no jobs.
Property management companies are managing rentals, not squatting. Some investors hold properties empty, but they aren’t in large enough numbers to be THE problem.
Salt in the wound: The default judgements locking in wage garnishment to pay illegal parts of the debt (on top of the immorality legal ones) because the kind of people who get these loans have many responsibilities and often can’t make an arbitrary court date, and it’s not clear to them the stakes are “show up or lose all recourse” (no appeals are possible).