The thrust of it is that the federal government would withhold funding to municipalities unless they meet certain home-building targets.
Critics worry that this will accelerate suburban sprawl in order to meet quotas. There are some provisions regarding rental housing and transit infrastructure, but with unrealistic time/budgeting constraints.
Fewer homes are built -> municipality receives less money -> municipality can’t afford to build out infrastructure like water, sewers, and roads because they can barely afford to maintain the existing stuff -> even fewer homes are built. My cat can figure that out, so either PP is dumber than my cat (possible), or his goal isn’t what he claims it is (likely).