No confirmation yet. But not discredited either
There are a couple other schedule Twitter accts.
The flight paths are all after the fact which makes sense for security but makes it hard to prove they had knowledge beforehand.
https://mobile.twitter.com/potus_schedule?lang=en
https://mobile.twitter.com/potus_schedule/status/1012528027425759232
https://mobile.twitter.com/potusschedbot?lang=en
https://mobile.twitter.com/potusschedule?lang=en
One is the same POTUS schedule account with oocasional Q-ish statements, one is 0vomit’s schedule, one is comments on Trumps, and one is a Trump Schedule BOt without details. I think the POTUS Schedule twitter is authentic.