If it didn't apply, then it shouldn't have mattered enough to keep it from Tony; in fact, he would have been able to stoically tease Steve for mismanaging it so explosively. Instead, Steve was not only admitting that he was lying to Tony, but that he was going to keep on doing it. Tony was embarrassed by how long he still watched Steve expectantly, only to finally look away with a sullen nod, setting the cards down between them and muttering, "Your game."