There is no such thing as a "JDL Germany". Especially not one led by a non-Jewish German teenage boy. He might be in his early 20s now but as I recall he was still in high school when he became the "leader" of his fake group.
I don't mean to insult any of the Gentiles here but to lead a Jewish group, the leader must be "from amongst your brothers" not a gentile kid who was not even alive when the real JDL was founded by Rabbi Kahane. (Devarim 17:15 and Rambam Hilchos Melachim 1:4). For him to proclaim himself as leader of a Jewish group is offensive.
While Rabbi Kahane was alive, fighting hard, getting imprisoned and his party banned in Israel- Weigang and his family were just regular Germans with no knowledge of the JDL or Israel.
He is an outsider who thinks he somehow has any merit in Kahanism. He does not.
His problem is that he is crazy. Complaining about how moslims are going to attack him, plotting violence, and on top of that committing lashon hara against Jews. Like I said, he has no merit in Kahanism, he is no leader and has no business in the JDL. He should focus to becoming a good Noahide and bless himself by blessing Israel like many Gentile supporters do. But to pretend to be a Rabbi or a Jew and mislead people into his fake group is wrong.