Oh really?Redlining has been replaced with credit score, and credit score doesn't have a number for race.
Home values are determined mostly by simple popularity. The appraised value of a home is based on the selling price of near by homes. If an area isn't popular the price of housing goes down. While that may well be because of racism, it's not policy, it's not a process designed to target blacks, it's a strictly social issue. People tend to naturally segregate. Right here in the city I live in there are areas that are predominantly white, Asian, Black, and Hispanic. I've never thought that was any kind of racism, it's just the way people are.

A Black couple had a White friend show their home and its appraisal rose by nearly half a million dollars
Tenisha Tate-Austin and her husband became suspicious when the Northern California home they spent years renovating was valued by an appraiser far lower than they expected.


Black Maryland couple sees home value jump nearly $300K when White friend stands-in; housing advocates demand action
“Black families shouldn’t need White saviors to get the home values they deserve,” said Dr. Andre Perry, Senior Fellow at the Brookings Institute.

This happens all the time, but you just choose to ignore the obvious because it doesn't impact you.