In Australia, for example, there were just 107 lab-confirmed cases of influenza this past August, as opposed to 61,000 in August 2019. The same dynamic was observed in countries like South Africa, Chile, and Argentina all countries that get their flu season during the North American summer....
Maybe one virus kills another.
Or maybe the flue tests are being calibrated not to pick up flu just like the amplification cycles are increased to pick up minute traces of coronasvirus.