Indeed it does not. I think the current game logic doesn't allow any effects to penetrate into blocked terrain, so the cleansing effect can't actually target the tile with Wall of Stone on it. See, for example, this thread: https://forums.cardhunter.com/threads/cleansing-burst-vs-wall-of-stone.2027/ Jon seemed open to the idea of changing it, which most people in the thread were in favour of.
