That seems problematic to me in so many ways.
Not only because how do you define "unworthy" (and all the totalitarian creepiness therein - as you say, it can be pushed to political opinions too), but because presumably because some of those "bad" people are still critical members of society or maybe mentally unwell and in most need of healthcare.
They say they won't be refused critical care but also cite ambulance crew abuse as a reason for doing this, so that seems to be at odds.
You can see the headlines now...
Mum of seven dies because NHS employee felt upset by them the day before.
Mum of seven dies because she called an NHS member a bad word during an autistic meltdown.
Mum of seven dies because she was accidentally registered as one of the unworthies by mistake.
And so on and so forth.
At the same time I agree that NHS staff don't deserve abuse of course. Wouldn't it be better to criminalise this sort of abusive behaviour and prosecute over it? (Also problematic.)