I suspect a lot of deaths can be attributed to pneumonia caused by masks:

https://www.nih.gov/news-events/news releases/bacterial-pneumonia-caused most-deaths-1918-influenza-pandemic

Tuesday, August 19, 2008

Bacterial Pneumonia Caused Most Deaths in 1918 Influenza Pandemic Implications for Future Pandemic Planning

The majority of deaths during the influenza pandemic of 1918-1919 were not caused by the influenza virus acting alone, report researchers from the National Institute of Allergy and Infectious Diseases (NIAID). part of the National Institutes of Health. Instead, most victims succumbed to bacterial pneumonia following influenza virus infection. The pneumonia was caused when bacteria that normally inhabit the nose and throat invaded the lungs along a pathway created when the virus destroyed the cells that line the bronchial tubes and lungs.