They think these taxes will simply be passed onto renters just like the nominal taxes landlords already pay now.

The reality is that there is no market for renters that could actually afford these supposed monumental price hikes. So instead landlords would simply be forced to sell their houses, increasing the market supply and decreasing the cost of houses.

That's the general equilibrium effect I am shooting for -- make it unprofitable for landlords beyond a certain size in an area.