In 10th grade most kids have done a year of algebra and are doing plane geometry along with simple proofs.
That must be it: the scientific sample of people he described the test contents too did not use proofs in their work. Therefore, introducing mathematical logic in 10th grade is not going to prepare students for the high-tech jobs of the future.
From what I've seen the biggest problems my sibs had with higher math wasn't the higher math, it was the algebra underlying it. They get one year of Algebra in 8th grade and the move on to Geometry assuming they have mastered it, but they havent.
There is a strong resistance from the kids because its either boring, too hard or not explained in a way that is relevant to them to see how it can be applied. This is among the main reasons why in the US the number of SMT college/uni graduates has not increased since 1980, while humanities has more than doubled.