You’re looking at the CDC, it depends on what and how many strains there are at the time. They are going to push flu vaccines, just like masks, shutting down the economy, etc.
Ask a doctor. My wife has been a nurse for 35 years.
The numbers from the CDC come from studies performed in multiple sites around the US each year looking at the effectiveness of the flu vaccine using three separate, independent sources for the information. Unless you’re trying to claim there’s some massive nation-wide conspiracy among doctors, hospitals, the CDC, and everyone operating the study sources, the numbers are what they are.
The flu vaccine is 40-60% effective depending on the year.