@EmmaGrundyForPM - I think that actually as a Jewish woman, Krug will likely also have experienced racism, and in the US, that could have been from those who saw her as Jewish or it could have been from those who (mistakenly) believed she was black. Krug's case is not the same as Dolazel's. Krug does actually come from a community that experiences racism in real life. I doubt Kansas is very Jew-friendly either.
As a Jewish woman, I've certainly experienced both anti-Semitism but also racism from those who mistakenly assumed I was a different race. I have been called a P*. I've also experienced racism from people who thought I was Roma. So I know from my own experience that Jewish doesn't fit squarely into 'white' either.
So I'm not sure that you can excuse Anthony Lennon but not Krug under the same grounds. They probably both experienced some racism, but that doesn't of course make it OK for them to claim to be African and claim money on the basis of it.
In reality, 'race' is a very blurry concept. Racism, however, is not. So I can well believe that both Krug and Lennon did experience racism as a result of looking not-quite-white. And this may have affected them psychologically and led them to identify as black.
BUT there is a clear line between looking and being victimised for looking not-quite-white and actually claiming quite specific African or Caribbean ancestry and making money off it, that was intended to support someone from that specific background. I have sympathy for them for the former, but the latter appears pathological and/or dishonest.
Dolazel I have no sympathy for at all as she is and looks completely white (without the heavily dyed and curled hair etc) and I can't imagine she would ever have experienced racism.