Do you mean this ironically? As in, the current upside down clown world we live in, then yes, everybody is a "European" to the loony left. However, this would be referring to European citizenship. So an African immigrant can surely gain citizenship in Europe, however it doesn't make them European.

I am using the word "European" to mean people of European descent, aka white people. All the white people from around the world are descended from Europe, because people from Europe are white according to official definition:

"White people is a racial classification and skin color specifier, used mostly and often exclusively for people of European descent." - Source