Kushner's piece in the WSJ [1] makes the claim that the French government's recognition of Palestine and public statements "haranguing Israel" has uniquely exacerbated this and asserts October 7th is the genesis of this behavior, with no mention of the behavior that Israel is being "harangued" for, which your comment seems to downplay.
The letter is a clear attempt to bully an ally into US style speech suppression by using someone that has both official position and a personal Presidential imprimatur.
[1] https://archive.fo/wzVUR