This appears to be their argument for "some"

The data show there were 59 over-50s among the 117 deaths who hadn’t received two vaccine doses. Assuming a take-up rate of the vaccine of 95%, in line with the rates seen among the oldest age groups in Britain, that implies some 1,180 people might have died from Covid-19 in the absence of vaccination. Ninety-five percent of that number—1,121—would have occurred in those who are now fully protected. Since only 50 deaths occurred in that group, that implies vaccines reduced the risk of death by 95%.

The "some" was referring to the set of vaccinated people. A small percentage ("some") of vaccinated people are dying of covid.

Given 85% in the cohorts likely to die are vaccinated but a little less than half who die are vaccinated, half actually implies the vaccine is roughly 85% effective against death. So trying to emphasize half of those who die are vaccinated in a headline about a place with a higher rate of vaccination than the reader's is trying to put a bias into the head of people who skim the news.