I think the fact that I set the bar pretty low is even more damning for SA. Imran during his reign never lost to WI who had a much better team than he did. The SA I am talking about did nothing but lose.
He also ended up winning a WC with a team that wasn't the strongest. I think he, and others that played for weaker teams, generally pushed above their weight and aren't downgraded for not beating the best side of the time. Players like Lara, Tendulkar, Murali, Wasim, etc. But SA tended to have better teams and genuinely could have challenged Australia in at least one period and certainly in a whole form of the game. Yet they failed when it mattered in ODIs (WCs) and all the time in Tests.
So, in my opinion, it's not even comparable. If SA had some mixed success, then I probably wouldn't put this point forth. It's not even one I totally agree with. Yet it's always cited and, TBF, does have some semblance of truth.