I am asking what is the alternative explanation why the US covid ICU hospitalizations are dominated (upwards of 90%) by unvaccinated people. If the vaccine were ineffective against hospitalization --as you claimed-- wouldn't the ICU unvaxxed percentage be 50%? I'm legitimately interested to hear if there's an alternative explanation (besides "All the hospitals in the US are lying").
The people doing the research had a foregone conclusion - "vaccines are crucial in our anti-Covid effort" - and then went out of their way to massage the data to prove their point.
Other countries had different foregone conclusions, and demonstrate entirely different results.
(Oh wait, you will suddenly remember about proper sampling and bias when arguing against a position you find ideologically abhorrent. Neat.)