Sign Language does NOT have a typology attached to it. Note that it the reference is to South African Sign Language…that is the accepted standard. There is no such thing as ‘Zulu’ sign language. This man for whatever reasons has been put forth as something he is not.
I am surprised that you are just becoming aware of how rotten the ANC and all things associated with it is.
Why are you expecting a bunch of criminal collectivists like ANC to have credibility? Read the history of the ANC and what they really are.