If the goal was to make the fact that the man who said those words is not important while the words are, why not just not mention Solomon or Ecclesiastes in the first place.
Stating that the person who said it is Solomon, and then making it clear that the speaker is less important that the words, serves to emphasise what is important.
The man who wrote it DOES matter, it DOES alter the effect. Solomon wrote it, in the book Ecclesiastes! Of course that makes a difference, and the writer here deliberately drew our attention to that. Dismissing a famous writer as unimportant carries more weigh than dismissing a complete unknown as unimportant.
This isn't some kind of simple logical operator statement that one can apply Boolean algebra to and simplify. This is already massively simplified; the writer expressed a lot of meaning in very few words. So much meaning, so compressed, that many readers think it's just the opposite - little information in too many words! People asking why this wasn't short are missing the fact that this IS the short version!
