Clearly not true in the case of Alfie Evans because Italy was trying to take him to Italy for treatment at their own cost. Not only did the judge rule that they couldn't, he kept them from leaving a free country, proving that they are Subjects not Citizens.
The wise Judge would not allow Alfie to be transported because he might suffer a seizure as opposed to merely being painlessly starved to death.
I need to know more about this case to comment on your comment.
Was he in an NHS hospital? Was the NHS obligated by treaty or otherwise to pay for his care?