Nah, examples cited of law firms discriminating against Jews occurred well into the 1960s and 1970s. There are plenty of partners at firms TODAY who remember being dinged by firms for being a Jew when they left law school. This is still relevant today, because those partners are still around and are held up as examples of Jews success and achievement.
And yes, the book actually notes that Jews are beginning to see a decline in the sort of cultural traits that made them successful in the first place. In part because that discrimination is being reduced.
I'm not sure why you try to argue this without fully understanding the premise. You make one point that is directly contradicted, factually, in the book. The second point is exactly what the author herself pointed out. Weather you think Jews are or aren't discriminated against today is irrelevant to the authors point.