I haven't read that link yet, but I picture two people eating raw cookie dough out of a giant bowl. If one says, "This is addicting!" that creates a stronger sense that they themselves (double plural pronouns with singular antecedent for the loss!) are getting addicted to the delicious, delicious goodness in the bowl. But if one of them says instead, "This is addictive," there's more distance between that statement of fact and their own current action, so it's less clear if they themselves (really? they themselves?) are getting in the process of addicted to the delicious, delicious goodness in the bowl. "Addictive" in that scenario might be better suited for a statement such as, "They say this is addictive, but I could stop right now." Even if that's a lie.
pixote