I think you are confused here, those Nintendo games in your last image ARE arcade games. Nintendo made arcade games back in the day and there are quite a few Nintendo arcade games.
If i search Nintendo in my arcade platform i get all these results.
Also in that last image you have highlited "Nintendo Arcade Classics" that is a playlist, not a platform, and it will show all the arcade games that Nintendo released. In fact all those "Arcade Classics" in that list are playlists made from the arcade platform, its just a easy way to find games, and you was offered the choice to create these in the import wizard, and you clearly left that box checked. You can safely delete them if you dont want them.