Not being familiar with the term XNU, I did a little clicking around and hopefully I understand a bit better:
This file is evidence that Apple has been running iOS/MacOS on the Raspberry Pi 3?
This file is evidence that Apple has been running iOS/MacOS on the Raspberry Pi 3?
Whether they had the full stack running—and how much of the stack is necessary for something to be deemed "macOS"—is up for debate.