He claimed to have a disease which turned his skin white. IMHO, he was skin bleaching.
Here's the problem with changing races. There are IIRC 17 genetic markers which biologically determine race. People can have them in any combination. If you have 16 white and 1 black, you're going to look white. If you have 15 black and 2 white, you're going to look black. But how many to you need to switch in order to transition?
Legally, it's a whole new kettle of fish. States' Jim Crow laws differed. IIRC, in one state, if you were 1/64 black, you were black. In another if you were 1/64 white you were white. In another, you had to be 33/64 white in order to be white. Nowadays,, I don't believe there's a legal definition.
The larger question is should it makkter. Shouldn't people be judged on the content of their character, not the color of their skin?