Typically yes but in this example it rings true, the really famous studies that show the massive IQ of jews was looking at kindergarten age children in an exclusive early learning program and comparing them to public school gentiles. In later life the difference in Jew and White IQ is negligible and "white IQ" differs greatly from place to place, generally western Europe is about ten points higher than Eastern Europe and the Scandinavians are ten points higher than them, the range is roughly from an average of 80 for slavs to an average of 100 for Scandis, with Western Euros and Anglos hovering around 90. Jews tend to hover in that 90-100 range as well. So while yes, Jews do have a high IQ, it isn't some astronomical difference like they like to pretend.
However IQ tests are easy to rig and are almost impossible not to manipulate, look at tt Chinese for perfect examples in how to rig IQ tests and just outright lie about academic achievement.