Might be technically true. The stunt person / actor may only know about the movie plans, and has not been told anything about a season 4. So, him not being aware of plans could mean there are no plans, or he's just not aware of them yet.
So the stunt person may or may not know that his information may or may not be true because he may or may not have been informed. Going out on a limb on that one. :p