I agree based on my personal experiences.
One of the concrete suggestions by the author of the blog post really strikes me as a step that we could implement, but we don’t: drawing from non-traditional backgrounds. And it’s because it’s an uphill battle. Much easier to do some low hanging fruit.
I’m not a minority in tech, but coming into my current job I had a semi-traditional background. Even getting first rounds was a struggle, only ameliorated by having a professional network of tech people, which is very much not something that you can expect a non-traditional candidate to have.
Seriously, my “get to phone screen” rate without network referrals was around 2-3%. With referrals was about 60%. That’s how bad it gets. So now when it’s in my direct control I go out of my way to look for non-traditional backgrounds in the pipeline and give them the benefit of the doubt during resume screening, paid for in hours I spend interviewing instead of programming