Eventually.
Did he ever answer the cops question of why he was there at that hour?
Did he have to?
He wasn't doing anything suspicious. Pulling into a empty parking lot is hardly suspicious.He's a free citizen in a free country.
Without a clear reason to suspect something illegal, the cop had no right to conduct an FI the way he did. He could've approached with a "Hi, everything OK?" if he felt the need to approach at all.