It sounds like they had the bowl suspended, which does sound like a risky thing to do with anything heavy.
I don't think anything will go wrong with a heavy bowl sitting on the enclosure floor though. I also don't set bowls on top of the substrate, but I set it *on the floor* and the substrate wraps around it lol.
I can see how a heavy hide has its risks, since it has openings that allow the snake to lift it up.
I use plastic hides and heavy water bowls.