Like I said as variants evolved the advice and science changed, in the US, UK and just about every country that administered vaccines but they still provided good protection from serious illness and death. This also from 2021
Analysis of nursing home COVID-19 data from NHSN indicated a significant decline in effectiveness of full mRNA COVID-19 vaccination against laboratory-confirmed SARS-CoV-2 infection, from 74.7% during the pre-Delta period (March 1–May 9, 2021) to 53.1% during the period when the Delta variant predominated in the United States.
https://www.cdc.gov/mmwr/volumes/70/wr/mm7034e3.htm