The strategy has less than a month (but close to it) for those that didn't know, it just wasn't as common because it wasn't safe to use.
There hasn't been enough time for the game at TH9 to evolve to defend it. Many said that loons were overpowered but that's because they had bases susceptible to loons and anti ground clan castles. OP, try again in 1-2 months after base designs have changed to adapt to that new meta specified to better defend against witches.

