Dan Adelman used to work for Nintendo, heading up their digital efforts. He's since moved on to other projects, and has been very closely tied to Axiom Verge. He was crucial in bringing the game to various platforms, Wii U included. Adelman and Axiom Verge dev Tom Happ have both said they want to bring the game to Switch, but nothing is official right now.
According to some tweets from Adelman, Axiom Verge could have been ready to go for Switch launch. That's evident from his tweet below.
Now here's where the situation gets a little messy. There's an image floating around out there of a Tweet from Adelman. The tweet says that he's been trying to talk to Nintendo about Axiom Verge hitting Switch for over a year now. Furthermore, the image shows Adelman calling Nintendo "douches". Now I don't know if that tweet was removed, but for the life of me, I cannot find that final tweet. I've come at it from every direction, and I can't even find any proof of it existing. I don't know if the last tweet was faked or just deleted quickly.
Here's what we do know. Adelman and Happ want Axiom Verge on Switch, but it hasn't happened yet. There's no doubt the pair have been in contact with Nintendo about the title. It would seem pretty obvious at this point that they're having trouble making the game happen, and it's not from a lack of trying.