Flu season is NOT about 2-3 months usually.

https://www.cdc.gov/flu/about/season/flu-season.htm

The exact timing and duration of flu seasons can vary, but influenza activity often begins to increase in October. Most of the time flu activity peaks between December and February, although activity can last as late as May.

It also does NOT kill Millions of people per season

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6815659/

Until recently, the World Health Organization (WHO) estimated the annual mortality burden of influenza to be 250 000 to 500 000 all-cause deaths globally; however, a 2017 study indicated a substantially higher mortality burden, at 290 000-650 000 influenza-associated deaths from respiratory causes alone