Has nothing to do with their closed eco system. They basically did similar stuff with some of the stuff in the sm3d collection thingy.
Nintendo is a company that only wants make new stuff, innovations.
For example, they ( mostly miyomoto ) has been quoted to not understand that people want another f-zero, as the game's principals and ideas have been fully flushed out and no new ideas could make it feel like something new.
They also usually dont do remakes/remasters unless its so new/different it can be considered a new game ( see metroid 2 on 3ds ).
If that is a smart business position to have, i will leave for you to decide, but do get your facts a bit straight :)
EDIT: also, nintendo has used open source projects for internal projects before, so idk how "closed ecosystem" is part of their stuff :)