How is this dismissive? It's a fairly straightforward statement of fact. The only way I could possibly read it as dismissive is if you interpreted it like, "These approaches are typically limited to [old, boring ass,] RDF-based web data and do not capture the [rich, luscious] dynamic, user driven interactions seen in [beautiful] modern web applications"

"Dismissive" in the sense of "let's dismiss it for the remainder of this paper, because it does not apply here".