In the USA they've been watching cable TV for years where you get your 100 TV channels via a physical cable network to the house. To provide cable broadband they split that existing tv cable to the house, so one end goes to the TV and the other to your computer or router. You won't see 'cable internet' in South Africa because there is no existing TV cable infrastructure in SA to begin with.
Instead of building a cable tv infrastructure in SA we jumped the whole cable TV scenario and went straight to satellite TV. In SA you'll have ADSL via telephone line, or via wireless, or cellular, or eventually via fiber optic to your house (which is by far the fastest). As for LLU; it will give companies the ability to compete for access to your existing phone line from the exchange to your house, therefore increasing competition and lowering prices. But this has nothing to do with cable TV/broadband.