Except they did have something to show, it was just not first party games. They had Marvel Ultimate Alliance 3 DLC, No More Heroes 3, and Bravely Default 2, the latter two of which are exclusive games to the Switch and the former was one they helped get off the ground.
I can understand the disappointment over no first party reveals, but to say that they had nothing there isn't right. They had a presence, it just wasn't what everyone wanted out of them.
Jon also had tweets where he was
freely speculating and joking about a potential TGA reveal, had the Gamexplain
video where they were bouncing off ideas for a TGA reveal, and expressed
disappointment at nothing being shown at TGA. None of that goes away just because of one joke tweet, one that has been done multiple times before and has gone under the radar otherwise until everyone started watching him like a wolf pack watches their next kill. This is likely not a case of knowing information, he made a joke he's made before and, as even some of us expected, no Smash popped up.
Don't look too deeply into things, all it gets you is a black eye and sadness.