Not to beat a dead horse, but I will
If Trump had been caught saying 'I think white people are superior to black people', that would be an unambiguously racist statement. If Trump is or was a member of the KKK, then that would be unambiguous, too.
Again, going by the OED definition, none of this matters. Even if Trump said "I think white people are superior to black people" I have no way of accessing his beliefs. Maybe he doesn't actually believe that white are superior to blacks. Maybe he's just saying it to stir the pot and irk his enemies.