And you can't automatically assume that when the new person feeds you the same line as the last guy, that they're lying too.
That would be somewhere between stereotyping and pernicious pessimism, and at your tender age you don't want to think about yourself in either of those ways, so we'll wait to see if this person will actually deliver or not. Great route to burnout.
Not even close. Can easily have three people manage the same project in a two year period.