I agree that the term is used to loosely as well as the term 'industry expert'. To be fair from a local perspective, I would label the carriers Telkom/Neotel/Mobile operators as Tier-1, then WA, CyberSmart, ATC, IS, MWEB as tier-2 and the rest Afrihost, Axxess tier-3.
Regarding Altech, it is great to see a company with ambition, but I think talk is cheap. To build a world class platform that can contain the local obsession with data is rocket surgery. You never know when your tier-1 providers are going to throw you a curve ball and suddenly you have major holes in your network that users will exploit to get that extra few gigs. It is not as simple as put a cisco here, ipc here, IS transit here and a cherry on the top. So far everyone has failed to get this right.