I'm not sure what you're trying to say here - are you claiming that all young people with severe cases of COVID-19 (including, for instance, 33-year-old Wenliang Li) took ibuprofen?

Or simply that there exists a small group of people such that all people in that group took ibuprofen, and there are also other young people with severe cases who did not?

Given that standard advice for young people (who are expected not to have severe cases) is to take fever-reducing medication like ibuprofen, I feel like we need a lot more information here before we can turn this correlation into causation.