In reality it's not quantum computing that we're talking about, it's high school calculus and algebra. You don't have to be a hardcore blank slate proponent to believe that most people can learn it. And that is what these people don't believe.
It's important to consider the goals of this committee. They propose this reform because they oppose the blank slate theory. The current structure really isn't appropriate to most people. Because it relies on a wrong form of the blank slate theory. They offer the wrong solution in my opinion, because they end up going too far the other way.
You have been to a remarkably bad college of education, if that was your experience. Which is saying something, because most of them aren't great, but for very different reasons.
Not that taking calculus takes a genius, as evidenced by more sensible countries.