My opinion and it is just that, is that the chair is there for the convenience to the spotter between groups. It is not there as a part of the course and therefore should be moved. Now, if he was using a stump as a chair, then since the stump is a normal part of the course then it shouldn't be moved but a lawn chair is carried in, and placed, therefore it is not part of the course.
PDGA # 42714
DGCR # 9429
ACE #1 - 3/3/11 East Metro Manor Hole 3
ACE #2 - 3/23/13 Live Oak San Antonio Hole 20, Star Arcon 214 ft forearm flick.