Ideally Snorlax Stall would avoid this situation by trapping something like Manaphy or Klefki in the active using Erika’s Invitation, something that cannot do very much damage. While doing 20 damage with Manaphy would eventually Knock Out the Snorlax that isn’t damaging the Manaphy, the Snorlax player can just use Penny after several turns to pick up the damaged Snorlax and send up a fresh benched one to take its place. All the time, the Snorlax Stall player hopes to discard your Switch, Warp Point, Switching Cart, and similar cards with Miss Fortune Sisters (or possibly discard Jet Energy with Sidney, but with only one Sidney this would be much harder, so it’s easier to try and negate Jet Energy’s effect with Temple of Sinnoh). Fortunately for the Snorlax Stall player, these decks run 2-3 each of Erika’s Invitation, Penny, and Miss Fortune Sisters, as well as 4 Pokegear to find them and 2-3 Pal Pad, 1 Team Yell’s Cheer, and Cyllene (the latter two of which are Pokegear searchable, even if they aren’t items) to recycle them.
It does mean having to pick your supporter cards very carefully, though, and your supporters can sometimes backfire, which can eventually add up to a game loss. It would be one of the more difficult decks in the format to play, and if the top players read Grant Manley’s article and start playing against Snorlax Stall accordingly, it’s success rate might go down. Might. Manley did say if every player knew how to play against it, not if the top players knew how to play against it. But even if these decks make day 2, they still have to make top 8 to have a chance at winning, which means having to battle through the more experienced players who made day 2 and have invested in their future by paying for the subscription or playtesting the Snorlax matchup until they discover what Manley did.