He bought his own wall, don't you see? The wall is only "fake" because it is owned by the one that buys it.
I realize this tactic might be strange but several of these exchanges have fees that are based on volume, and when one's fee is at a minimum one can afford to buy/sell into their own walls.
When these walls are created they are to induce a certain mindset. First people will place their sell orders below the wall price(explained in previous post). Second they inflict a panic FOMO when suddenly a huge purchase of that wall and the coins before it are bought. Third as they have created a momentum in buying they can start offloading their below wall priced coins.
What you said is what I mean't, but maybe I articulated it badly. I mean't someone put up that wall to start people panic selling into the sneaky unnoticeable laddered small buy orders he secretly put up.
Unfortunately for him the market is so bullish that it soon became obvious someone would buy his wall if he left it up for long. His cunning plan failed.