I don't understand what you mean? For me, it appears all 3 students have been changed. The 3rd student is changed into a black female. I am not doubting they want to inject diversity (although i didnt say it above) my contention is they likely view the original as a blank background, which they inserted 3 "new" anonymized students into. Its not that they turned 1 person "black", its that they changed ALL 3 PEOPLE entirely
Given how little the two students on the left changed, I highly doubt the AI made a creative decision to completely randomize only the student on the right. I think it's more likely that they did it in two steps: tweak the faces, and replace the student on the right.
