The US tax stuff is 100% nonsense. I mean, reall. HMRC and the IRS will come (if they haven’t already) to an agreement, which will have nothing to do with the rules “ordinary” people have to play by. It’s a diplomatic issue, not a fiscal issue. Someone at the DM just had a “I wonder what....” idea and actually put it to paper.
(Many many people with exceptional circumstances (eg extreme wealth, notoriety or fame) get similar special consideration)
Incidentally, the DM’s article on MM and the winds of change she’s apparently blowing into the RF is actually quite remarkable. It’s a page of absolute non-fact, non-news, non-novelty. It’s 100% speculation and supposition. Quite remarkably skilled, really.