Nah, I mean, if that's what the calcs say, that's cool, but in dozens and dozens of battles involving that situation, I've never once not 1HKO'd Terrakion (most likely 4HP) with Archeops's 110 Acrobat (after sash or item), and Jolly 252 Tornadus's Flight Jewel Acrobatics. In fact, I've always had Tornadus do around 90% to 4HP Terrakion's with just it's 110 Acrobat.