The PMBOK isn't perfect, it's possible they overlooked it or had the same thought as you: facilitation requires there to be people in a space together to facilitate i.e. a meeting and therefore it didn't get called out. For the test, learn what's in the book and in real life, have meetings
I have a general issue with the fact that meetings aren't defined as a tool or a technique for the define scope process. Specifically, my issue is how on earth one can use the interpersonal and team skill of facilitation without meetings. The PEMBOK is so fond of using meetings as a T&T, how on earth is it not a T&T for this specific process?! Any feedback would be much appreciated.
Training for Project Management Professional (PMP)®, PMI Agile Certified Practitioner (PMI-ACP)®, and Certified Associate in Project Management (CAPM)®