I'm not sure your jQuery question is quite of the same nature as the nano-questions mentioned in the article. Your example is actually fairly conceptual. Yes, it requires them to know the syntax, but asking them to explain the difference ends up being fairly high level.

The examples in the article have no high-level component at all. I don't know what package File is in off the top of my head. I've never needed to commit it to memory, since the IDE will look it up, and if that doesn't work I can look it up myself. It's not useful information. Your question, on the other hand, is useful information.