The battlers in the video looked competent so I am going to assume that the turn spent with Topsy Turvy to raise Noivern's sAtt was because Boomburst is a special attack. Draco Meteor is 210 bp after STAB. I can't totally see the HP bar, but it did half to Gallade correct? So a spread special normal move at +2 would have to be at least 140 BP to finish the KO or deal physical based damage since Gallade has much weaker physical defense. This is going under the premise of it being a special attack since he just spent a turn raising his sAtt for a reason. Whichever way you look at it though, it definitely won't be a hyper voice clone with a new name.