I believe that info in the link will be new due to the current environment - I don't recall anything like that showing historical data. Here's a link that speaks to the 17-18 season and how they "estimated" flu numbers at that time, the look back period and I'm sure until Covid. Click on methods used to calculate for some additional info. I will continue to look for the statement that they recorded stats only until April in previous years...it was there. I'm sure because the "reporting" was done from the various medical facilities to report "flu like symptoms" to be included. By April the incidents had dropped low enough they didn't report them any longer (as I type this that is what I read - I'll try to find that).
https://www.cdc.gov/flu/about/burden...18/archive.htm
Not trying to argue, just pointing out the disparity in the way the numbers are determined if trying to make apple to apple comparisons. And kind of interesting to see how we guestimate these things.