Those escape chutes can be found on about 25% of the newer ships these days. They are designed to replace life rafts for the crew.
They have always been a bit controversial. They only work well when the ship is more or less upright.
Earlier models had too few baffles in the chutes, causing crewmembers to break legs when they reached the rafts at the bottom.
More recent models work far better.
I have trained on several different models. They are quite exciting to jump into. The trip to the bottom is very fast - and very much like a carnival ride.
They are very efficient when they work well, but bear in mind that they were designed for the relatively slim crew.
"Large people" tend to get stuck in them.