As I see it, the article describes something in that vein, but then immediately flips and reasserts the title, which suggests integer DH is a special case of EC

As I see it, the article describes something in that vein, but then immediately flips and reasserts the title, which suggests integer DH is a special case of ECDH, which does not seem a convincing characterization to me (it could be my misunderstanding; maybe someone could further clarify if it is conclusive).