I think it's saying that any legitimate criticism (e.g. of Israel) is overtaken by anti-semitism. So in Israel's case there is both legitimate criticism and ant

I think it's saying that any legitimate criticism (e.g. of Israel) is overtaken by anti-semitism. So in Israel's case there is both legitimate criticism and anti-semitism directed towards it and the anti-semitism and discussion of it becomes more prominent. Then there are those who, as you point out, equate the two.