I believe it is a question of supply & demand; years ago a I had a sociology professor ask why black babies were “cheaper”, and I responded that there were many more available, and “cheap” had nothing to do with it (this was at a time when NJ’s main newspaper featured a “negro of the week” for adoption; sadly, they were usually troubled kids - not babies).
I don’t know why somebody wouldn’t adopt rather than deal with the implanting stuff; while this guy is patting himself on the back for the great sacrifice he has made for black people, he left three kids in foster care...
The concept of going through a catalog and looking at what fertilized embryos were available, and saying to each other (I paraphrase) "Let's select the black embryos, because we want to show society how un-prejudiced we are, and set an example for other people to see racial boundaries don't mean anything."
It reeks of selfishly motivated social experimentation. If they did the same thing by adopting, nobody would likely say a word.