He did mention sub, although he probably should have put some more emphasis on it. With Sub and Metronome, you can break past mono-Scald Vaporeon and pretty much all Toxapex, but you sacrifice either some serious immediate power from Band or revengekilling ability from Scarf, so I'd call it a niche set at best.This vaporeon calc is very weird because you're calcing the 5th consecutive hit and with a defense drop. Considering the first hit only does 25, the max hit does 50, and vape has wish + other moves, I don't see how this breaks through. You'll get ice beamed or toxicd or even just scald burned and stalled to death. Similarly the EQ calc is on the 5th consecutive use of the move, and it's likely the Pex would do something back to you in that time, or notice the metronome damage on the second hit and go to an immunity. In fact they'd probly assume you're scarf and just switch out after 1 eq.
I haven't been using vish enough to say whether it deserves a rise, but i don't think these reasons are good enough of an argument.