It would not be the first time palestinians have been called amalek. Considering other ministers hang out with people voicing those ideas, I am not sure it can be as easily dismissed. Ben Gvir had a portrait of Baruch Goldstein in his office who had those views.

There is about a month between the letter and the video clip being published, a little more from the speech. Someone even took the time to write a song.

Smotrich also invoked amalek, but he continued with "what Rafah needs is complete destruction". It is very clear what he meant.