How so what you mean? Link/source
Long story short, cacs like him tried to push away from the Tom Metzger and even David Duke types for their brand of Milhouse brand of white supremacy
The L.A. riots gave this strain of caccery some wiggle room in regards to applying race science and other bogus mumbo jumbo to justify the degradation of black people, but further extended it to liberalism and cosmopolitanism.
His work along with him being a spokesmen for the Council of Conservative Citizens (the same group Roofe first checked out) paved the way for the alt-right because it's essentially racial sociology for them. It's dressing up a burning cross with a PhD and nuance.
Only differences between him, Spencer and all these other bussy sucking cacs is he isn't Anti-Semitic.