AZ Pilot - you are correxct that in YOUR picture it appears the shower has somewhat frosted glass, but you still see the fixtures inside clearly. It also appears the toilet wall is solid.
The regular inside cabins do not look that way in these renderings.
I have written to NCL to ask for clarity on this topic. I will let you know when they reply.
I am the editor, but I also speculate, ask questions and play devil's advocate. I reserve the right to change my mind.