I've just registered - as I had to comment.
They have done nothing and I am baffled by this response. The USA have very clear instructions on how you can entry the country. All they have done is follow those instructions. This is not illegal or a back door tactic, I look forward to watching the vlogs!
The USA has banned brits and Europeans in general directly from entering. They have made it very clear that they don't trust people from euopean countries at the moment. Short of closing their borders (which has bigger ramifications) they have made it difficult as possible to come in. Whether you agree with the US government's stance is another matter, but the fact is they don't want us there.
To mitigate people from going the back door route they have the 15 day rule in a green list country. That again eliminates many people as most won't be able to do it. Government's can't stop everyone coming in (unless they close borders) but they can and have made it as difficult as possible. The rules are there to discourage as many as possible. It also allows those who maybe genuinely need to get in (e.g. to see a sick relative) a way of doing it.
They aren't doing it for fun, it's not a case of 'oh well we actually do really want you, but what fun it will be to go via somewhere else'
Additionally florida is in crisis, and these two (and others) have said fuck locals health, fuck over worked hospitals, fuck water shortages , fuck oxygen shortages...I want to go to Disney so I will because I'm special and rules don't apply. I'm also going to film 60 below average vlogs and profit off this. They clearly haven't been impacted by the pandemic at all, and just don't care.
Topping it off they post a smug video saying how they will be living in luxury for a 5 week holiday to their audience who can't go anywhere, have lost jobs, loved ones etc.