Interesting. That's a pretty good deal for BF/Business class US-Africa at only 120K miles (I'm specifically thinking about South Africa). Presumably you'd do KL or AF from Europe to S. Africa (though AF doesn't seem to fly to CPT...)
Compared to VS at 180K miles, which is basically 2x 90K (and more in line with what you're actually getting -- 2 long-hauls in each direction).