Except if there is a fire and you realise it's stuck. A normal lock can be kicked in if not opened with master key, but that contraption sounds hard to break in to.
There are large gaps above and below, plus the hinges are plastic and the walls are plastic covered chipboard (or something similar.
The bench lifting is part of the system - you can't leave rubbish or water on the bench.
You could solve a safety access issue by having the bench corner removed and replaced with a breakable component; but I'd speculate the materials are such the hinges already serve that purpose and changing the corners would lead to a lot of accidental breakage.
I feel like a fire at a swimming pool might be more rare than a fire elsewhere, just by virtue of being surrounded by water (pool, showers, etc). Maybe I'm wrong.
No idea about this specific example, but if it is anything like normal bathroom locks, I'd expect that you'd be able to rotate the bench back upwards with some sort of key/screwdriver/lever from the outside.
I'd worry about someone being ill while sat/leaning-on/collapsed on the bench though meaning you cant rotate it. I guess this is an issue for any door where a body could block it being opened? At the least in a changing room cubicle these are usually open at the top so someone could climb over in an emergency.
The bench lifting is part of the system - you can't leave rubbish or water on the bench.
You could solve a safety access issue by having the bench corner removed and replaced with a breakable component; but I'd speculate the materials are such the hinges already serve that purpose and changing the corners would lead to a lot of accidental breakage.