Musk has now surpassed Carnegie. You are right about Mansa Musa (for now), but the gap is closing. According to google today, Musk is at $334B, Carnegie peaked at a modest $309B, and Mansa Musa had about $400B, though there are quibbles about personal wealth vs. kingdom’s treasury. If you want to compare Musk and Musa, I think you could reasonably add the GDP of the US to Musk’s fortune, since he is one of the puppeteers behind Trump. All figures adjusted for inflation, by the way.
The amazon reviewer is confusing chloroform (an inhalation anaesthetic that, in movies, is used to knock out people for kidnapping) and chlorophyll (a harmless substance used by plants for photosynthesis)