Per the CDC website. Check it yourself
Flu cases 2019-2020……. 38,000,000
Flu cases 2020-2021………1674 …..covid wiped out the flu in 2021. Imagine that.
Influenza is a less robust virus and mitigation in 2020 and 2021 winter and spring with social distancing, more mask earring, and higher attention to hand washing etc likely did stop influenza in its tracks — as well as many other viruses that are not aerosolized, but droplet spread.
Basic science is basic science.