the reason we had near zero flu cases this past year is because the PCR test used by governments across the world couldn’t tell the difference between Covid-19 and the flu. So they called it all Covid-19.
https://www.cdc.gov/csels/dls/locs/2021/07-21-2021-lab-alert-Changes_CDC_RT-PCR_SARS-CoV-2_Testing_1.html