First off this has got to be one of the strangest cameos/easter eggs ever.
Basically, hackers discovered a while back that the Switch has NES emulator known as "Flog" or golf backwards. In it was the NES game Golf but it was unknown how to activate the game. Apart from one user who accidentally discovered it back in July i.imgur.com/THJejIU.png who no one believed.
Now hackers have found out to unlock it which involves the following steps (which sounds absolutely crazy and I thought was fake when I first heard it). - Play on July 11th, the date of Iwata's death (Switch uses Nintendo servers for time check, while hackers used a Switch not connected to the internet with 1.00 firmware and also makes sense for the guy accidentally discovering it back in July) - Start from HOME menu - Detach Joy-Cons - Perform the "Direct to you" hand gesture