You typically find this idea of teaching abstract advanced concepts first in anyone who believes in a constructivist theory of education, which this article smacks of quite a bit. The problem with constructivism is that it really only works with beginners who stumble onto a natural talent that gave them these foundational skills, or whose parents were wealthy and educated enough to have them and teach them to their kids. Constructivism's lie is that it claims to want to teach everyone, but then is only successful with natural talent.

If instead you teach basic skills in the best way, through fairly rote learning combined with application, then later abstract concepts are possible and can be discussed. The idea that you have to do one (abstract concepts) without the other (basic skills) is simply an attempt to limit the types of people who can succeed at an activity to only those people exactly like the teacher.

In other words, attempts to teach abstract concepts first as if basic skills are pointless are simply attempts to weed out undesirable people, which is what this article's proposal would do.