No, NQT has gotta kill Toast.
Block Johnny
Basically, if Aristophanes, Varsoon, and Toast are telling the truth (and I have no reason to believe they aren't) and if Johnny can be blocked (which I also assume is true, because it says I can block nightkills in my role pm), then we're solid. I block Johnny, NQT kills Toast. We go into the next day with a 2:3:1 advantage, and if that doesn't win us the game, we all vote Johnny to either force a no-lynch or get town to just hammer him for us and give us the game. If there's a no-lynch, we go to the night at 2:3:1 and block johnny/kill ari, giving us a majority the next day that we can use to kill Johnny and win.
This covers every almost every possible worst-case scenario that can happen. Toast will still be able to prime someone tonight, but he's gonna die before he can do anything about it. If Johnny is lying about his win condition and he wins by scorched-earth-ing, we'll be at enough of an advantage to just power through to his lynch. We avoid NKing Varsoon, preventing redirection shenanigans. If my roleblock only prevents Johnny's kill and he decides to make someone else immortal, it doesn't matter, because we'll kill Ari the next night, and Ari can't have anything happen to him.