Uh..well, besides the fact it looks like he died of a heart attack, the Sinovac vaccine is not manufactured by Pfizer...unless I'm reading something wrong.
Either way, doesn't appear there's any evidence linking it to his death.
The WHO Strategic Advisory Group of Experts (SAGE) on Immunization has issued Interim recommendations for use of the Moderna mRNA-1273 vaccine against COVID-19 in people aged 18 years and older.
www.who.int
Company profile page for Sinovac Biotech Ltd including stock price, company news, executives, board members, and contact information
www.bloomberg.com