And neither is the traveler the Gardener.
It’s a representation of the 2 sides of Paracausality.
Edit: upon further reading, it would make sense that the Traveler and the gardener are the same.
The Winnower uses casual speech. The Witness uses we when speaking of itself.
-
The winnower has never spoken to us, and that lore book was actually given to us by the Witness, which is why Savathun was interfering.