That article makes it sound like "countersignaling" is forgoing a mandated signal

I said "standard" because game theory doesn't talk about mandates, but that's pretty much what I said, isn't it? If you disagree with that usage, what do you think is right?

Incidentally, in von Neumann's model of poker, you should raise when you have a good hand or a poor hand, and check when you have a mediocre hand, which looks kind of like countersignaling. Of course, the information transference that yields the name "signal" is rather different. Also, I'm not interested in applications of game theory to hermetically sealed games.