Uh, does it not seem logical that if there are fewer black/Hispanic minorities in tech, that there will be fewer blog posts from that perspective?

But just because you don't ever see it discussed on HN doesn't mean that it isn't. Try out the HN search engine:

https://hn.algolia.com/?query=racism&sort=byPopularity&prefi...

https://hn.algolia.com/?query=african%20american&sort=byPopu...

Here's a discussion last year on the YC blog post that was titled, "YC Open Office Hours for Black and Hispanic Founders"

https://news.ycombinator.com/item?id=10228326