What would he say differently if he also knew what they were?
he'd say "those are planes" because they are planes
Are people allowed to lie and withhold information in politics?
It started as senators jumping up and down and creating a state of emergency, from seeing drones flying around... New Jersey. Which is like being scared that they're flying around Kansas. It's been a nothingburger from the start. That isn't to say that drones shouldn't be tightly regulated. But the fear mongering is clearly not Trump-specific.
Is Trump getting the daily intelligence briefings? Last I heard, he has not gone through the normal transition process. So he might not be getting the information that a normal president-elect would be getting.