The US Nursing Home data is the “gold-standard“ record level data for what happened in nursing homes after the COVID vaccine rolled out.
The signal from this data is clear and unambiguous: both the primary series and booster COVID vaccines increased the risk of death from COVID. The bivalent vaccines did absolutely nothing for the elderly (at least it didn’t make things worse, but it didn’t make things better).
The two things that reduced the infection fatality rate (IFR) were:
Natural immunity (everyone had had COVID one or more times)
The arrival of the much less deadly Omicron strain as the dominant strain in late December 2021