See, you're implicitly asking me here to defend Netanyahu. I believe Netanyahu to be among the very worst leaders of the last 75 years, a world-historically bad prime minister who has done more than almost anybody to heighten the intractability and human tragedy of the Israel/Palestine conflict. If you think the "Amalek" speech is irrelevant to that analysis, I agree.
What I object to is the deployment of religious tropes that essentialize Netanyahu-ism or Kahanism into Israel, or, worse still, Judaism as a whole. If you're going to get into this "Amalek" stuff, get it right.
If not, it's not like you needed it to take shots at Netanyahu. There is a decent chance that when he is ultimately ousted, he's going to be imprisoned by the Israelis.