They distribute the Calls or Puts over multiple months and years so it becomes difficult to tare without looking at the whole picture. Also they often sell Puts shorts instead of buying Calls and vice versa. They also use ETF's that have multiple positions they are manipulating. When they can get an ETF with say over 50% of their manipulated stocks, they can use ETFs. There are multiple ways to achieve a net Call position or a net Put position without actually being net long Calls or Puts.