I think my question is what sort of pacing does he mean? Like in his story example, some of the scenes feel a little bit faster. While others feel a little bit slower. While length of sentence may have a lot to do with it, I can't help but wonder if this is a little simplistic?
I know some books I've read, you might have very long scenes that go on for pages, that do to how it is structured it feels faster because of the length of paragraphs and sentences.
While another scene may be shorter in reality, but feel like a drag if the sentences are long and paragraphs huge. Plus even with shorter sentences, the choice between summarizing and showing effects speed.
I think there is a lot more to pacing than if it's fast or slow, but maybe it's just me.:/
As far as reading any forth level writer, not sure I agree. There could be forth level thrillers, but that doesn't necessarily mean I like thrillers. But I may very well love a forth level contemporary.