Jews get to be a race now?
Actually I don't see a problem with separating Jews from other 'whites' as they do form a sub group to some extent. The problem is the other subgroups are less well defined. This makes the data pretty meaningless.
It reminds me of when Europeans talk about violent America and our high murder rate. When I looked into this a few years ago I discovered as a young white male I had less of a chance of being murdered then a young white male in Germany, and I forget where else, and if anything at the time the US had a lower murder rate in my sub group than much of Europe (but not all). So for the subgroup of young white males the high murder rate in America didn't apply.
The same type of thinking would apply to intelligence. Simple genetic drift might apply to intelligence differences due to geographical separations, and your subgroup is the only one that matters to you.
Now lets add in the genetic mixing and it just gets to hard to classify. My children will have ancestors which come from pretty much ALL of northern Europe. The only possible predictor of their IQ will be my wifes and my own.