True, but creatively reinterpreting the line is not unreasonable, given the lack of specificity in the film itself. Especially since, as I said, the idea of a Starfleet officer referring to a former Federation President by his old Starfleet rank is as absurd as someone calling the former U.S. President "General Eisenhower."
I get what you're saying, I have to disagree however. The writers said exactly what they meant. That's canon, there is no reinterpreting that.
Author's statements of intent are important, but they aren't canon. The
film is canon. And in this case, the author's statements conflict with common sense.
Which doesn't, of course, mean that it
wasn't Jonathan Archer that Scotty was referring to. The line is ambiguous; it could be, it might not be. But there's no contradiction with canon by having it be ENT's Archer -- nothing canonical established that Archer died before 2258, as the bio screen's death note wasn't actually seen onscreen -- even if there is an arguable contradiction with common sense.