Can you use the Nintendo Switch Pro Controller with an Apple TV? I am wondering if the Nintendo Switch Pro Controller can be used with both the Nintendo Switch (obviously, it can) and my appletv(4th generation).

The specific controller I am referring to is this one:



I have looked online for the answer to my question, and the most information I could find relating to connecting Nintendo Switch’s official wireless controllers to an Apple device were articles such as one from TechCrunch and another from AppleInsider on how to connect the Joy-Con controllers to a desktop or mobile Apple device.
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