They define unvaccinated as anyone in the study who didn't get their first dose by Nov 2021. That feels like a pretty tight window to me. I don't think they checked to see if those "unvaccinated" people got vaccinated during the 4 year followup, especially given the mandates that forced people to get them.
It's the full vaccination rate; as of Dec 1 2021 it was 69.89%. A month later (i.e. those Nov folks are getting their second dose) it's 74%; latest number on the chart is 78.44%.
How would they calculate 4 year all-cause mortality on people who got vaccinated after Nov 2021? In case you haven't looked at a calendar recently, it's December 2025 now.
If you "know" that a study whose title you are predisposed to disagree with has "BS" in it, something tells me no amount of scientific evidence is going to persuade you.