Artists whose work displayed by Grove mislabeled as 'members'

Dozens of artists who appear to have no connection to the Grove apart from having their art displayed by it are listed as "members." These include Samuel Brooks, Norton Bush, G. Cadenasso, Paul Frenzeny, Percy Grey, Christian Jorgenson, Larenzo Latimer, Xavier Martinez, Daniel O'Connell, Gorttado Piazzoni, Granville Redman, William Ritschel, Julian Rix, H.E. Smith, Jules Tavenier, Frank van Sloun, Virgil Williams, and Theodore Wores. The "source" for all of them being members is a broken link on the fine arts website of Saint Mary's university. I searched around the website and found a link that indicates only that the the works of the above artists were displayed at the Grove. However, the link gives no indication that any of them were "members" of the Grove. 
This is an obvious violation of WP:V/WP:NOR. I tried to remove it and provided my rationale but got reverted without explanation. I would appreciate some comments on this.