There are some stringent rules about this. It's a major academic infraction, and he has incident after incident. It's not paraphrasing. He made a habit of stealing other people's intellectual work, making up data, and lying about his background. I've been in academia. This is major sin.
Major sin. Absolutely.
"What is good for the goose is good for the gander" -- can't have the students doing the same.
If the prof can do it then why can't the students.