"A ridiculous overstatement"

Mr Nathan wrote: “Time to start killing these people till article 50 is invoked”, adding “perhaps remainers will get the message then.”

Ukip councillor Terence Nathan says 'Remainers should be killed until Article 50 invoked'
The Independent

Is Terence Nathan no more qualified to be a politician than Boris Johnson? I don't think he feels that he made a ridiculous statement. He instead feels that he just stated his honest opinion too strongly. What did he exactly want to convey with the phrase "time to start killing these people"?