what you're saying is LITERALLY false. it's election interference in germany. his main actions would be covered in Manipulation campaigns in the information space or disinformation campaigns, but you could even make a case it's a hybrid threat. He'll probably also indirectly sponsor them monetarily if possible, which should also be illegal.
EITHER way, the one of the first three actions are all easily observed from the megalomaniac's behavior.
If you are trying to argue the courts won't be able to take action before he gets the AfD in power, sure. Is a law a law if it ain't enforced? No, I agree there.
Not OP but I'd wager he will say that you shouldn't treat them like kids, that's already looking down on them. Just because they got duped repeatedly doesn't mean we shouldn't lose our ability to empathize. They just started their introspective, assist it as much as you can and you can make them go from conservative to progressive even. The movement needs all the pebbles it can get.