Think they meant that one as its the closest match to C-GHPE in terms of passengers.
Isn't DUB an oddball as it's mainly Y that's being sold with virtually no business class? Seasonal holiday routes sort of thing, AC had a subfleet of B763s that didn't get the new business cabin that used to fly these routes which is why DUB used to get the same few aircraft. The B77L has a much better product up front I think? Does C-GHPE have the new AC interior I wonder?