Last year without the vaccine, saw a similar decrease in cases and deaths for the same time of year.
But last year there was no vax to credit with the decrease. This year there is. So now nobody can prove the vaxes are responsible for the decrease.
Correlation is not causation.
There were ups and downs but the last time the 7-day average of deaths was as low as it is now was March 2020 . One year ago today the average was more than triple what it is today.