No, you didn't say it, but I'm claiming it MEANS the same thing.
Lets take an extreme example. We'll call it "BFG" diplomacy. In this face to face variant (lets pretend it's super popular) everything is exactly the same as a press game, but everybody at the table has a loaded gun and may open fire on the others Whoever wins the game, or survives the firefight, is the winner.
Now, if you were to claim, "And I will bet that all if all the truly great players at BFG diplomacy stopped playing, then they would, given time, come to dominate traditional press diplomacy as well," you are basically claiming that the skills that it takes to win the firefight are ultimately irrelevant as to who the best BFG player is. Ergo, you claim one's pistol skills are ultimately meaningless in BFG diplomacy. The same people would have won regardless of whether or not you are allowed to shoot everybody in the face.
It's the same argument, yes?