The vaccination rates for people who received both shots look very similar to me 49% vs 54% and vaccinations in the US are higher for the elderly, 80% fully vaccinated, they got first crack at the vaccinations..

The UK says 90% elderly have been vaccinated, who also got first crack at the vaccines.

So the numbers look very similar but the one story is that the unvaccinated are the ones getting infected almost exclusively, while the other story is that the vaccinated elderly are still the most at risk group. There is a way both could be true, but that's not really how this story is being spun, this is (although from a different story)

Walensky called it “a pandemic of the unvaccinated.” Fully vaccinated individuals can still get Covid-19, but they are protected against the worst of it. They should not need hospitalization and will almost certainly not die

And that shouldn't be different in the US than in the UK.