I don't think it's a mistake because that was the regular price of breakfast before covid, when it was still a buffet. But maybe it's an oversight and they forgot to update it. It's still unacceptable.

Forgot to mention: when we were at Das Loft bar, around 17:30 (it opens at 17:00, btw, and Bar-Terre in the lobby is open from 12 until 18... it's like they don't want to make money), a group next to us tried to order some food from the menu and it took them 10 minutes because whichever meal they chose, the waitress would tell them it wasn't available. After a lot of back and forth, they finally ordered some stuff, only to be told by the waitress 2 minutes later that those items weren't available either. At that point one of them lost it and asked, echoing my thoughts: "Do you have anything at all?!"

This is SO/ Vienna in 2021.