Can you use the Nintendo Switch Pro Controller with an Apple TV?
After reading the article you linked to on AppleInsider, I noticed that it says that 


  They will not work with iOS games, nor tvOS.


Since these controllers are not "Made for tvOS/iOS" certified, they will be unable to be used with your Apple TV. You will instead need to use a controller that is certified, like the Horipad Ultimate that is sold on the Apple Store. 

You can find more compatible controllers that are sold on the Apple Store here