Hispanic supremacists have their own supremacist ideology called 'La Raza'.

As for the 'white supremacist' angle, it most likely has to do with Enrique Tarrio's conviction for 'seditious conspiracy' and the January 6th DNC media circus, that the average American is completely indifferent to.

By establishing that there are more hispanic 'white supremacists', the clown circus conviction of Tarrio might become more convincing, and in so doing, lend credence to the January 6th DNC media circus (complete with film directors).