It's impossible to know with the data we collect. Census tracks the homeownership rate, which tracks if the house is owned by someone living in it. However if you are a tenant living in a house that someone else owns and lives in it as well, for example if you are an adult renting in your parents house, that counts as a homeowner owned home. We do not collect the tenant non-ownership rate, but it would be much higher than the inverse of the homeownership rate.

I guess it depends a lot on what you measure in "most": housing per head or housing in square feet? Lots of heads cramped into rented minimum viable housing. Lots of square feet held by owners who occasionally live there, when they do happen to be in town.

(the general upwards trajectory of real estate makes it an investment even when it does not generate any income, do much better than owning a boat!)

tenants by definition don't own it, he was building a false argument