you can do a little scientific experiment yourself: Change your linkedin location to San Francisco, add the buzz words and $big_tech_company to your profile, make sure you are of under-represented minority in profile, and watch recruiters banging your door and offering to apply and headhunt you for pay raise

See, I look at what you wrote and draw the mirror-image conclusion: "Here is a person who would prefer to shame others for being 'impolite' than let them say out loud what is obvious to literally anyone."

The fact that the situation is as GP described is undeniable. But there can be reasons why things are this way that extend beyond what the racists of yore believed about genetics. Most obviously: Not all subgroups of white people are equally represented in tech either. (When was the last time you were in a team where the majority hailed from Appalachia?)

But actual investigation and remediation can't begin until we can first point at reality and describe it as it currently is.

I think you're reading that the wrong way.

Rather than "talented engineers can already be hard to find, now divide that by 20".