Definitely no. The racism was against color. If you weren't white you weren't welcome, and if you were black, you were especially not welcome because the sign is specifically against the blacks. Many people who consider themselves Africans are black, and they were just as much discriminated for their color as African Americans.

hi! there's lots of room for more input, but you may be interested in these earlier posts

When segregation was legal in the US, how were prominent black people from Africa (or other non-North American countries) treated on visits to the States?

Did the Soviet Union have a "bite-sized" refutation of Capitalism?