How was he able to single handedly build up the volume necessary to affect what is literally the most highly traded futures contract? I imagine he wrote some a

How was he able to single handedly build up the volume necessary to affect what is literally the most highly traded futures contract? I imagine he wrote some awesome C++ code plugged into MetaTrader or TradeStation, but certainly they have checks in place to ensure that he can't just place tons of orders that fake the volume of a whale without having lots of proxy servers that also place orders (which would also require proxy accounts). If so, wouldn't he have to have multiple accounts with his broker (I assume Interactive Brokers, given they have the only reasonable rates of all the retail brokerage firms). Can someone shed some light? I know a little about finance and I'm genuinely curious how some random guy could possibly pull this off without some complicity with his broker.