As I mentioned, not every stall team will be running Toxapex and Clefable, and when you consider it from that perspective it can be considered a Stallbreaker. However, you're right, I was perhaps a little zealous in labelling it a Stallbreaker as a Stallbreaker should be good at handling most stall variants, even so if you weaken Clefable or Toxapex it can certainly do that job. As I said before, I think there's been enough discussion on Keldeo already, so I think it's best to leave it here.
Every stall team should be running toxapex and clefable...Keldeo is sort of decent in this meta but against stall unless you run choice and can make some great predictions its not doing shit. There are much better stallbreakers than sub keldeo and also that seems sort of like a bad set for keldeo in general atm. its not setting up on shit.