Sure, that's the whole point - my claim is that to get to the stage where you do something actively, you need to pass through the stage where you grasp what an application of the thing would even look like. So I guess the post can be seen as pointing out it's useful to notice when this intermediate step is missing, if you care about the quality of your learning. Note that it's a heuristic that can be applied instantly and subconsciously, as opposed to "doing something actively" (which may require resources, waiting for external circumstances etc.).