. . . he can bring peace between the Israelis and Palestinians in six months, or perhaps less, if both are "committted" to peace . . .
It is a true statement with a big if. Sort of like saying I could be a woman if I had been born with indoor plumbing.
It's a complete fabrication invented by the author. Trump said he would know if it's possible for there to be a peace process at all within 6 months upon meeting the two parties. Not that he would have it all sorted in 6 months.