The title was a hook to draw a reader in, then he made a point which attempted, in my opinion, to hoist the leftists on their own petard.
I don't know about the statistics he was using, so those might be full of holes, but when I read it, I thought the main point was "Okay. You want to ban flags? Let's say I go along with you: how about banning the Mexican flag?"
Fair enough.
My reference was more directed at his numbers.