Trump's a compulsive liar man. Guys's a fucking nutter. Anyone who habitually goes around claiming to have the best this, best that, be the least this, least that, is not a sane person. Proper 'football manager? completed it mate' kinda mentality. You can't blame people for thinking he has it in him to lie about shit like this...and employ people who are willing to massage his ego.
The Presidential Doctor was employed by Obama and has an exceptional reputation.
It's just not a realistic scenario that several well respected professionals would just lie about this stuff