It's a picture of bathroom at a prison, not jail. They have partitions. That makes it more private. You seem to think the toilets and showers are out in the open around cellmates.
That may be true in the past, but no longer. Things are changing.
That does not make it private. That's inane. You take a picture of, literally, a public restroom without doors and say it is "private"... That's absurd.