Yes, it did...
“Influenza vaccination in the United States has long been recommended for all persons 65 years or older.9 Vaccination coverage for this age group increased from between 15% and 20% before 1980 to 65% in 2001.10 However, 3-year moving averages of unadjusted excess P&I mortality rates among people 65 years or older—compiled for the Healthy People 2000 initiative11 to track the effect of vaccination on US influenza-related mortality—rose substantially during this period.12 This was surprising because influenza vaccination is thought to be highly effective at reducing influenza-related mortality.13- 19”
Yes but you can’t say the mortality rate would be the same if they didn’t get vaccinated.