And that is exactly the volume vs. percentage schism I'm talking about. You're taking an increase in volume as something the other side wants, a concession that might be made in exchange for something you want.

Market rate housing does not spontaneously generate high income workers. Industry recruits them, regardless of housing construction. Those tens of thousands of workers are coming either way; the variable that can be controlled here is whether they gentrify existing buildings or divert to new ones. They're going to create more affordable-housing need by displacing people in existing units than they would in infill.