will the scouting that takes place during the playoffs count towards this season or will it carry over to next season?
This makes little sense. If height and age were available at second scouting, there wouldn't be anything to trade, since the only way that both 'traders' had this information is if both players fully scouted the guy, so nothing to trade there.
Still, players lying about their height and age happens all the time. All-time greats such as Wes Unseld, Charles Barkeley and even Bill Russell kept their real heights a trade secret.