^Objection, assumes facts not in evidence. Why does everyone assume "Admiral Archer" means an impossibly old Jonathan Archer when it's about a zillion times more likely to be his child or grandchild?
Abrams/his Cohorts did say Admiral Archer was meant to be Jonathan Archer. And Archer's file in IAMD did say he was eventually promoted to Admiral, and even lived until 2245. Of course, that would mean Scotty's been on Delta Vega over a decade.
But even if we ignore this, Admiral Archer must have been someone prominent in Starfleet, if even his dog is well known to a cadet. Therefore, my point stands that Scotty wouldn't have taken the celebrity pet of a well-known Starfleet admiral and used him in his transporter experiment unless he was 100% confident it would work.