After the demolition, I am now replying to myself in case it might help someone else.
When the demolition of tiles and clinker started, it turned out that the walls were also made of metal. The walls also lacked a traditional frame with studs. Instead, the metal sheets are bent and joined together with rivets in their seams. Therefore, the tiles were removed down to the metal sheets, which, after consulting with a carpenter, will continue to serve as the framework when rebuilding the bathroom.
The ceiling metal sheets began to be removed using a metal nibbler. It was used to make notches at each wall so that the metal screws at the top of the wall securing the ceiling could be accessed. Then the first metal sheet was removed by loosening the metal screws connecting it to sheet 2, allowing the first sheet to be taken down. This process continued until the last sheet was down.
To summarize, it has proven to be a very robust construction, though it complicates matters when trying to remodel. Neither the carpenters, tilers, electricians, nor plumbers consulted have encountered this type of construction in a villa before.