This makes a lot of sense, I'm sure Playtonic in particular would love to work with Ninty. After all, their studio are focusing on the WiiU version and letting Team 17 handle the porting to other platforms.
Now let's assume the rumours of a Smash Bros. NX are true. They could always sweeten the deal by providing a small little representation. Say what you will. Smash Bros representation sells games.
Of course, it's unlikely. But there's always the possibility that Cloud got in to say to Square, "We'd like to see FF7 Remake make it's way to the NX.
That's a very big IF. And I've got absolutely no proof of that.