Indeed. If I understand, the difference is that this starts from asking what ways a particular concept can be expressed in Greek, not by asking what different things a particular construct can mean. For instance, what are the ways that Greek expresses different aspects of a of time or space, not what are the things that a Genitive can mean. I imagine you could construct a set of topics by taking the existing text of various grammars and identifying the settings to which each construct pertains, flipping the organization.
This feels much more concrete and approachable. Also more easily integrated into, e.g., a Living Language lesson or a writing exercise.
This is analogous to Adventures with a Lion for prepositions.