I want to believe

Returning to the subject of today’s earlier post: The authors of that study write this in summation:

Statistical findings, said Heuser, made us realize that genres are icebergs: with a visible portion floating above the water, and a much larger part hidden below, and extending to unknown depths. Realizing that these depths exist; that they can be systematically explored; and that they may lead to a multi-dimensional reconceptualization of genre: such, we think, are solid findings of our research.

Nothing this vague counts as “solid findings.” What does it mean to say that a genre is like an iceberg? What are those “parts” that are below the surface? What sorts of actions would count as “exploring those depths”? What would be the difference between “systematically” exploring those depths and doing so non-systematically? What would a “reconceptualization” of genre look like? Would that be different than a mere adjustment in our generic definitions? What would be the difference between a “multi-dimensional reconceptualization of genre” and a unidimensional one?
The rhetoric here is very inflated, but if there is substance to the ideas I cannot see it. I would like to be able to see it. Like Agent Mulder, I want to believe — but these guys aren’t making it easy for me.