6.3 for 239 pounds is probably untrue.
But, among all the things Ronny Jackson said abot Trump's physical and mental health these are the least important things
He probably ask the doctor to make him officialy 1 inch tallen than he actually, which would 1) put him just below the IBM threshold to be considered as obese and 2) make him the same size than Lyndon B. Johnson, only 1 ich shorter than Lincoln and taller than every other US president in History. And he probbly ask the doctor to maker him a few pounds lighter too.
But that's just his ego speaking. He wants to be officially, 6.3 fts and 239 pounds, fine. If having the doctor lying about his height and weight can satisfy him and spare us another Twitter tantrum, fine.