Not really. I think a day or two extra is typical punishment for minor problems (not cleaning your room, etc). It said in the linked DN article that he was kep

Not really. I think a day or two extra is typical punishment for minor problems (not cleaning your room, etc). It said in the linked DN article that he was kept locked up the rest of the month (not moved to a separate institution). They are quite tolerant there, as I said that place is also used as last stop to get people used to not being inside walls after years in prison. Either the prison administrator was incompetent, probably not uncommon, or the guy had a low pain threshold. (same Disclaimer as in the GP.)