It's (probably) not about the NHS but more about "we kicked out so many illegal immigrants last year, aren't we great?" (not that these people are illegal immigrants, but hey, let's make burden of proof tests that are hard for them to pass), but, incredible how seemingly easy it is for the Home Office to be heartless to the point of killing people via red tape.
Well, Brexit won't kill anybody (hopefully).
But on the other hand, a year from now, the pandemic will be largely forgotten. Brexit will still be going on.
The Black Death (Bubonic Plague) lasted for decades, killed more than 1/4 of the world's population and set human civilisation back by a century or more. It took more than 200 years for Europe's population to recover to where it was before the pandemic. Many regions never recovered economically, or only recovered centuries later. You really think Covid-19 is going to be that bad?