OK, then that's backwards, sorry. The fact that A is hard to implement in terms of B doesn't mean that A is a "lower level" (or even "higher level") construct in the sense people usually use those terms. It just means that the two metaphors are incompatible.
Honestly I was asking the question because I thought you had some deeper point in mind I couldn't see. But you just had it backwards.
The exact sense of the phrase you excerpted is explained in the next clause of the same sentence of the comment.