Why do you think so as the page literally goes on stating that the results are non- reproducible and we're heavily over exaggerated (not by the researcher though)
The page says that listening to Mozart does not, itself, make you smarter (contrary to the pop culture understanding). I’m saying I wouldn't be surprised if growing up in a household where classical music is present nets you a better outcome on average because of the many other confounding factors.
If you read chapter 5 in Freakenomics you’ll understand what I’m talking about.