I would say that "50% of the variance in intelligence is heritable" is in no way in opposition to "gifted kind of education is something that would help everyone to achieve more".

1.) 50% is a lot of variance.

2.) There is more to learning and achievement then just where you stack against other kids.

But also, Einstein had good education and his family cared about his education. Moreover, Einstein is effectively outlier - arguing that single most known and popular scientist is repeatable framework does not make sense.