The problem with Wittgenstein is that his terms are very specific and their meaning is very precise. When one reads “nonsensical” in that sentence one tends to think “ah, so they are stupid” whereas he likely means “they do not represent the world” (no-sense: without reference), which for Wittgenstein is true because language is unable to grasp “the thing itself” (the “state of affairs, in his terminology).

That is my understanding anyway.