Does using Yasuo, Unforgotten's ability to move a unit back to base cause that unit to become exhausted?

Ruling: No, the unit does not become exhausted. Exhausting a unit is a cost only for Standard Moves, and most other move effects (including Yasuo's ability) leave the unit in its current state.

Nuances:

• Yasuo's ability can move exhausted units (they remain exhausted)
• Yasuo's ability cannot be used at instant speed or as a reaction unless it has the Reaction tag