This type of study is meaningless. It is like when you find a house on Zillow that is many thousands of dollars under its “zestimate”. Typically, they are complete pigsties that need a lot of cleanup and repair, or as you say they are in a high crime neighborhood. In the town where we live the values in the north side of town are twice what they are in the south side of town for similar square footage and lot size. This discrepancy keeps growing. Who wants to live near a bunch of low income apartments or deadbeats in rental houses, not to mention the thugs and drug dealers?
Yep, this happens in just about every city and town. There are nicer areas which people are willing to pay more to.live in.
Then there are less desirable areas which are cheaper, because they aren’t such nice areas.
This guy apparently is angry that areas of big black population are frequently in the less desirable neighborhood category.