the someone was Win. I’m not a lift mechanic but I take Win at his word, as he owned the Mtn and would know way more about this stuff than anyone on here.
Actually someone else said it first. Then Win chimed in saying "yea, they're both Dopp lifts so that isn't uncommon". I still think that was a simple mistake and he was either reading or responding quickly and thinking of another lift. There's really no disputing the fact that they are not both Dopp lifts. Slide Brook is Dopp and GMX is LP. That's really not debatable.