The violence is implied by Dieudonne, well known for his popularizing the quenelle gesture, a covert Nazi salute mocking those in authority.
More here: It's known as "La quenelle." It's a modified Nazi salute for Muslim solidarity against the Jews. It's also used by neo-Nazi skinhead groups and members of the rap/hip hop community in France as an expression of extreme disdain for Jews in Europe and Israel.
“Perhaps this character is unfamiliar to you.”
No, he is not.
“The violence is implied by Dieudonne...”
Says you. If that is the basis for applying this law (one person’s opinion of an implication), then I could say that violence is implied in any statement, and quash any speech that I want.
The rest of your post is irrelevant, since he isn’t been charged with inventing a hand gesture.