Which has been thoroughly debunked by the scientific community. "Food and Chemical Toxicology" is not a respected journal, and most famously published the "GMO foods cause cancer" paper that ended up being retracted.
The link you provided is just a standard vaccine efficacy over time study using data from Sweden. These are a dime a dozen and all show two things: 1) you are less likely to die when vaccinated, and 2) immune response reduces over time so you need boosters.
Which has been thoroughly debunked by the scientific community. "Food and Chemical Toxicology" is not a respected journal, and most famously published the "GMO foods cause cancer" paper that ended up being retracted.
Here is a good video on why the author is a quack: https://www.youtube.com/watch?v=YwoRsj7AE7A