He's basing this off of a myth that a 911 share trade = news coming, the closing trade here today was 911 shares...
If you google it, you can find websites that claim these things, but nothing I'd cal a reliable source of information...
I personally think it is all a myth... But you never know... Anyone can place a 911 share trade... so I personally doubt there is merit to it... But many think otherwise, so... whatever...