The reporting indicated he went heavy into call options before returning. The stock went from 10 to almost 80 in a few days, so short term options gains could easily explain his $200 million score. I don't know how reliable the data is, but some reddit sleuths found opening trades worth $8 million that were closed for approximately $208 million.
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Plugging all of that into a spreadsheet, I'm looking at these approximate numbers:
Our mystery suspect traded at least 95,000 5/17 call contracts.
Edit: He also had 25,000 5/24 calls!
He bought in for at least $6,000,000 $8,000,000 (including the 5/24 calls).
He sold for at least $168,000,000 for a profit of at least $162 million dollars for an average return of 2800% $208,000,000 for a profit of over $200,000,000 with an average return of 2550%.
And two weeks later DFV shows up to reddit with a $205M portfolio