Well it is. It's under his profile options, where it lists signature. So technically, it is. However, we are in as much trouble as he is if we claim all our signatures are ours too. He cropped it, resized, and now it's his. We don't make signatures, we enhance it. He just didn't do as much.
Ya but you see, he didn't make his. He edited somebody elses. I make sigs, I start with a stock, put it in a custom canvas and edit it myself. I doubt he did any of that.
That's still taking work that's not yours, and calling it yours. It's enhancing it. This is why signatures are not called art.