No one bothered us. We have a timeshare in Florida which we exchanged through Interval International for the week in Branson.
No one at the resort even mentioned a timeshare presentation. They were all very cordial and answered our questions about the resorts affiliation with other resorts in the area. The resort is part of a much larger concern who is located across the street. The staff said tha we could stop by to see what they had to offer but that was the end of it.
Attending the presentation is completely optional. No pressure to attend.
Get an answer from Cabins at Green Mountain staff and past guests.