Seems to invent new terminology. A more traditional term for "on-demand" learning is "just in time" - a kind of epistemology."preliminary learning" aligns with the "just in case" epistemology of factory-style education.
1. You don't invest in learning something you won't use, and;
2. Learning something you will eventually use, but not in the near future, has an opportunity cost: What could you be doing with that time and attention that will produce value now?
I will make a separate comment describing what I think the drawbacks are, but I wanted to focus on my support for your preferred nomenclature.
It seems like the article is lamenting the fact that many of these become "not in time" learning in practice.
:-)