Not really...CDC can make “in the 95% UI range” estimates...suffice it to say that there are tens of millions of flu/flu caused pneumonia cases per flu season.
https://www.cdc.gov/flu/about/burden/how-cdc-estimates.htm
https://www.cdc.gov/flu/about/burden/index.html
Based on no reported numbers except pediatric deaths. Sounds accurate to me. Must be why they get that tight range of 22k to 55k deaths for this year.