... then does that mean that now, greater numbers vaccinated people are catching it?
As otherwise, you'd expect (somewhat) lower case numbers overall than before because of less transmission, but hospitalisations and deaths to follow the earlier patterns too, because the virus wouldn't really behave any differently in non-vaccinated people once they'd got it.
So the fact that the link between cases and hospitalisations/deaths is weakening must mean that the difference between now and Jan is caused by a lot more vaccinated people testing positive, but not getting seriously ill?
I'm not sure I like that conclusion. I mean, I'm glad if serious illness and death is lower, but I don't like the fact that loads of vaccinated people are still catching it mildly, and increasing the chances of a vaccine resistant mutation happening. I hope I'm missing something, like there being a huge proportion of cases detected only because of asymptomatic testing that weren't showing up in January etc.