I believe it, the only games announced for Switch that are not coming this year are, Kirby, Yoshi both we have seen, along with Metroid Prime 4, Pokemon and FE which all were officially announced for Switch.
Pikmin 4 has been mentioned but it has yet to be officially announced. Yes they could get delayed but right now they are the games announced 1st party wise for Switch next year, but for some reason people think games unannounced and unseen have a better chance of coming before them.
We have no idea how long these games have been in development, both TPC and Tanabe have talked about NX games in the Prime and main Pokemon series, these games have been planned for a while.
If Prime 4 and Pokemon Switch was shown at E3 they would have take a lot of attention away from the 2017 games and I think that is why we didnt see any footage.