I am not bothered to look for his article but I am sure he used the term "ideas are worthless". Otherwise that phrase would never have independently stuck around here so long.
He did write "The fact that there's no market for startup ideas suggests there's no demand. Which means, in the narrow sense of the word, that startup ideas are worthless."
What I mean when I say playing with words is that he qualified that statement with "in the narrow sense of the word." He was also referring to startup ideas in particular.
This discussion is getting to be a little ridiculous because you're splitting hairs and and missing the point entirely.