This is false on multiple fronts. First it isn't official in any capacity yet. A statement from a source does not equate official. Second, it would not be it being cancelled. It not being opted for renewal is what it would be. To be cancelled would require already being in production, about to be released, or airing. Third, it would not be the first if it met the other criteria. That would be "The Spiderwick Chronicles". That series was completed and had a tentative release date, though not announced, for Disney+. Instead it was removed from their service entirely and allowed to be shopped around. That would be the first official cancelation for Disney+