Well, as Descartes said, "Cogito ergo sum" as being  only thing that can actually be known with certainty to any individual.  But the lack of proof positive doesn't make it false either.  At least in this case the sources are identified as members of Trump's New Jersey Gold Club, not just "unnamed sources".  And I do seem to recall Trump on the campaign trail saying he wouldn't live in the White House if elected, so the alleged comment would sort of follow.  But again, pretty trivial story.