That does count... If you predict 0 tries for USA, but Ngwenya scores 1 and you named him, that earns you 2 points... Also, if you deliberately predicted NO try scorer for a country, and they don't score any, that also gives you 2 points.
You understand? The try prediction and try scorer prediction don't have to match. You can predict 3 tries with no try scorer or no tries but a try scorer. Sorry if this looks a bit confusing