I don't think that disproves the culture argument. American culture is segmented. (Modern marketing and politics have leaned heavily into this segmentation by the way.) For example, if you grow up exposed to ghetto culture you will probably not value education. The PISA assessment doesn't tell us that white kids who grew up in the ghetto are magically competing with Singapore's best. And we know that the ghetto is less white than the rest of America. Ergo in aggregate, US whites outperform. There are of course a million exceptions to this i.e. grow up in a certain type of Asian immigrant household and you will probably do great on these tests and maybe learn piano, violin etc. as well.

Now whether ghetto culture or ghetto economics is the main contributor to poor academic performance... I will leave that finer point up for debate, but my point here is the US has big differences in educational outcomes based on NEIGHBORHOOD, if your neighborhood is high crime and the schools are broke, your educational outcomes tend to be bad.

If there is a culture related problem, I think it's that the people pushing this trashy culture, for example music that glorifies rape, drugs and gangs, code it as black culture and use that as a way to deflect criticism. You're a racist if you don't like hip hop! It would be an understatement to say that many black Americans want nothing to do with that lifestyle or image and have evolved well beyond it, yet it still gets called black culture. It is a cultural weakness that we don't see rape, drugs and gangs as bad stuff to promote and reward, full stop, and not a thing we should be educating the next generation with, regardless of the skin color of the performer, or its roots.

BTW for whatever it's worth I'm white and I grew up in the ghetto. My parents forced me to take a public bus for an hour each morning to a magnet school in the rich part of town. Years later I met up with my white childhood friend from down the road who had gone to our local high school. I had a bunch of academic achievements and a college scholarship, he had a gunshot wound in his stomach. He was a smart guy when I knew him but the ghetto had its own plans for him.