My training only goes , and I cannot provide information on specific statements or events that occurred after that date.
However, as of my last knowledge update, I am not aware of any public statement made by Dolly Singh, the former SpaceX talent chief, where she described Elon Musk as a combination of Einstein, Nikola Tesla, and John D. Rockefeller. It's possible that such a statement could have been made in a more recent interview or event that I am unaware of.
To verify the accuracy of the statement, I recommend checking reputable news sources, conducting a search for recent interviews or articles featuring Dolly Singh or Elon Musk, or reaching out to the BBC directly to inquire about the specific commentary you mentioned.