The article the page cited also includes this quote from Gordon-Chipembere:
“That whole fashion statement comes out of Baartman’s presence. (...) [White European] women were really anxious that their men were going to be lowered into wanting this sort of exotic, hyper-sexual African woman.”
The Wikipedia page for the bustle says that the garment came into fashion around the mid to late 1800s, while Baartman died in 1815. While Baartman was certainly fetishized and exploited both within her lifetime and afterwards, is it likely that a garment specifically designed to emulate her body would come into fashion decades after she died? If not Baartman's body specifically, is there still evidence that the bustle was designed to emulate the steatogypic body type found in some southern African ethnic groups?
There's nothing to elaborate on because it's not true, I have to say. I've dealt with this idea in a previous answer: