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Allow me to explain :)

A skate park needs to be excavated so it is concave - like a hollow bowl so that the skaters can go up and down. The sides of this excavation need to be retained so that land doesn't fall inside the bowl. A quick and cost effective way of retaining is by building a gabion wall.

A gabion wall usually consists of stacked stones in a wired mesh and is easy to install so I imagine that's what's happening in your image to hold the sides of the skate park. It's a pretty common technique in landscaping.

Of course, a lot of gabion walls are adapted as benches but then they usually require a wooden/stone/brick panel on top to allow for people to sit on them. Which is what I meant by you were right in your thinking that it could be tailored to become a bench in the future.

Hope this clarifies my comment :)

Thank you for your explanations :) What i meant was that it is used as a bench by people who are at the park and, on the other hand, i never saw it being used by skaters. ;) cheers!:)