That piece was used as feet on Jaw beast and splitter beast. Two of the sets that introduced that piece.
They were bear-esque, bipedal when they needed to appear threatening, quadrupedal by nature.
Not to mention the jumpers used them as feet in promo material. So they were designed with the idea that they could be used as feet.
Technically, he didn't actually say you were wrong. He just said the jumper feet count too. He was taking what you said, and adding to it with new info we didn't have then. At least that's the way I read it. He might have meant it as a correction to your post, but I wouldn't just assume that. Just my thoughts.