He's not saying "it's clear when someone is preaching hate" (it is certainly often couched in oblique language to avoid attracting ire and opposition), he's say

He's not saying "it's clear when someone is preaching hate" (it is certainly often couched in oblique language to avoid attracting ire and opposition), he's saying, "it's pretty clear when someone is making a threat or incitement to imminent, actual violence." Neither "The Jews will not replace us" nor "euthanize the rentiers" constitutes an imminent threat of violence.