It really isn’t. It comes down to the fact that if you’re a high-paid tech worker you can outbid basically anyone else for your rent. If an area doesn’t build housing for tech workers and other such high-paid young people, you force them into the existing apartments, forcing out anyone who was living there previously.

It’s less “trickle down economics” and more “build housing for me or I will outbid you for your own apartment”.