I know Sam personally and have trained quite a bit with him.
He is a formal disciple of both Liang Shouyu and Yang Jwingming (traditional ceremony and all). However his curriculumn is not too close to either of these teachers. Sam began Taiji with Brian Gallagher in Vancouver, who was himself a student of Raymond Chung.
Sam has spent the last several years teaching seminars, mostly on topics of the Yang Chengfu curriculumn. He teaches the 108, weapons (sword sabre and spear), push-hands (8 basic drills, dalu, moving-step, 4-hands (foward and backward timing)), 88 two person form, and Qigong. Sam usually returns several times to a location to offer specific topics. So a school more removed from the West-Coast/Pacific Northwest, may not have covered all of these topics.
As well, Sam put together some small forms for seminar teaching. He calls them 5-section forms. The 5-section solo form is designed to be trained as a two person form as well, acting as a bridge into the much more involved 88-move two person form. There is a 5-section sword form that also can trained with a partner to study two person sword work.
Sam did train Chen, Xingyi and Bagua from Liang Shouyu, but I suspect he would probably not have taught any of them in a seminar context out east.
I don't recall ever meeting anyone from the club you mention, so I can't speak about it, but I will say that Sam has one of the most complete undertandings of Push-hands in the business. His touch is subtle and capable of great... I'll say "vitality." His knowledge of the 24 energies of push-hands is detailed and very clear.
"The heart of the study of boxing is to have natural instinct resemble the dragon" Wang Xiangzai