Small shed i made!! Made doors & fixed cedar cladding! Was a nice project, simple & happy with the finish. It holds the compounds for the owners swimming pool.
Yes I believe it's treated, when I've watched tv programmes on house renovations from that part of the world (Aus/NZ) all the tantalised timber they use is pink.
Here in the UK treated timber is usually green.
I suspect that the situation might be different in various parts of the world but here in NA there are framing materials made by a company called Pinkwood. The company has created a pink-coloured, non-toxic, water-based coating that resists mould, moisture and fire.