How did Jesse Owens victory in the olympic games symbolize victory over nazi racism?

The performance by Owens directly contradicted at least the "physical" part of Nazi claims of a "master race" to which all other races were inferior. The original Aryan designation (a neutral ethnic classification separate from the general Caucasian race) was interpreted by late 19th century racists such as Arthur de Gobineau as a superior race. In its later Nazi (and neo-Nazi) form, it was a concept of scientific racism and white supremacy.