I think what they did was common practice until that point. When my kids were little many hotels offered a listening service.Even if they didn’t do it, their neglect led to it.... they failed to safeguard their own children. I can never get over leaving them it’s just absurd.
Personally I’d put mine in the buggy at and when they were tired point it to the wall.
I remember going to a function at a hotel and there was a row of buggies after the dinner pointing at the wall while parents had a shindig. I joked I better not have too much to drink and end up taking the wrong baby upstairs!