I assume they didn't feel the need to issue warnings therefore. They did recommend use of the safe deposit boxes, and they didn't offer baby listening because the resort wasn't suitable.
What kind of service? A physical listening one? I don't quite see why a baby-listening service wasn't suitable if someone was assigned a particular block or at most two. But then, the absence of noise when listening at the door wouldn't necessarily mean that all was well and the time between checks would presumably not be much different to what the group (barring the Paynes) did themselves.
I've noticed a few hotels in various countries that offer some kind of baby-listening device in rooms that someone monitors at the reception and knows where to contact parents if there is any unusual noise. From what I've read, that's usually when the parents are dining in the hotel restaurant, but it could still mean quite a few minutes from noise to parents getting to the bedroom.