Internet speculation and misinformation?..... sounds like the wing with the fire smoke alarms didn't go off and the general alarm was a manual pull because the guests Paul Jones quoted said they heard sirens which would indicate the alarm was placed after fire spread.
I did this for an occupation before becoming a facility manager. It's totally incredible to me that a large hotel wasn't required to have quartelies , annuals and weeklies. Sick. They are extremely lucky no one died.