Disinformation campaigns don’t necessarily need to come up with new rhetoric, they just need to normalize it so that it appears more acceptable to some people. Amplifying and normalizing this sort of thing among certain groups helps to solidify their views and further radicalize them.
It’s like any other form of advertising, you try to find something that sticks then beat it to death. Then you find something else, and repeat the process. In this case the antisemitic rhetoric is still unfortunately effective.
Some more context from a BBC article