That doesn't answer your question precisely, however, I think anyone who consistently follows Andrew will see quickly his accuracy is pretty high.
My favorite posts are when he says someone just came in and bought or sold 10 times the average daily volume of options totaling a 10 million dollar bet on the direction. Insider trading is illegal of course. But if a trader makes a 10 Million dollar bet...AND that 10 million dollar bet = 10 times the average daily option volume (so we're not talking about a stock where a 10 million dollar bet is 5% of the average daily options volume on that stock). I personally come to 2 conclusions, #1 a person who can make a 10 million dollar bet Most Likely didn't get to the point where they could place a 10 million dollar bet without being a good trader, And if they are willing to make a bet that large in comparison to the average daily volume activity of that stock...then they may know something.
My favorite is when Andrew posts that a trader just came in and bought a position that Exceeds ALL of the current OPEN INTEREST COMBINED on that stock. Do you think they may know something???
Just my thoughts