Citation needed*
Well, when media are proven right most of the time and Trump is repeatedly caught lying...who are you going to believe? Media who largely accurately report on the imminent departures of agency heads despite Trump saying he's "Very happy" with them, only for them to resign within days? Or the guy that claims he doesn't settle lawsuits...after bragging about how he doesn't lose lawsuits because he settles them, and settlements aren't a loss.
Reporter is claiming there's a memo about this that he's seen, and this would hardly be the first insane thing that Trump reportedly said/asked about that has proven true despite denials.
Remember when the initial reports of his desire to buy Greenland were met with cries of "FAKE NEWS" from many Trump supporters before Trump confirmed that they were true?
And yes, assuming that Trump is lying by default is a safe assumption given the past 4+ years since he started campaigning.