Because archaeologists call everything sophisticated including stone-aged hand-axes if they're comparing it to something less-sophisticated, such as the pastora

Because archaeologists call everything sophisticated including stone-aged hand-axes if they're comparing it to something less-sophisticated, such as the pastoralist communities that people usually think of when considering southern Africa. "Sophistication" in this context though, I think is referring to social complexity rather that strict technological sophistication. I have no comment on the use of the word "triumph", except that it's very subjective and the kind of thing I tend to ignore.