@Daojoan This isn't "truth," this is NIMBY bullshit masquerading as social policy. He's proposing taxes on rentals, but not on home ownership, so renters will end up paying more than homeowners. Then he repeats the canard about vacant housing, when American housing vacancy rates are low; New York has a regular housing survey with a line item for units that are vacant because they're held for occasional or recreational use, and they're 1% of the supply. Less NIMBYism, more housing construction.
@Alon
"Poison pill" means the taxes are so great on the rental owners that it becomes untenable to own a house just to rent it to others. That doesn't increase rents, it increases available housing supply for people to own a home that the can live in.
He's proposing a tax so people can become homeowners.