Is the author actually right to live and work in the US, and only fly back to Britain for getting medication subsidised by British taxpayers? And is the fact that he can do this just an indication of US healthcare being screwed?

The post doesn't tell too much about facts and I don't know the British rules for eligibility to NHS, but I think it's possible he could be committing fraud. If he were doing the same with my country's national system, it certainly would be fraud (though it would probably not be possible in the first place, because we have a Big Brother that knows more than the British one).