Like I said maybe they shouldn't have been doing Aarti, not in the Gurdwara anyway.
But the picture in itself shouldn't be a problem. Mahapurkhs have been known to keep pictures of Devi Devte, they weren't allergic to imagery, especially imagery you could say that makes up "Dharam" as a whole. Maybe not the picture shown in the video, but such imagery was commonplace and is part of our heritage. As is evident from the small selection of pictures I posted.
The level of Hinduphobia amongst our people borders on idiocy.