I watched the whole clip, but I don't think Schiff's prediction was very good; the most important (and hardest) part of predicting the market is the timing of the event. He was correct that the real estate bubble would end, but didn't predict the year ("whether it starts in 07 or 8").
If the documentary is correct about the accuracy of Armstrong's models, then he can predict economic events to the year. There are a few examples mentioned where his predictions were accurate to the month and even the day. The documentary came out in 2014 and does include a list of predictions for 1998-2015:
1998 Collapse of Russia
1999 Low Gold & Oil
2000 Technology Bubble
2002 Bottom US Share Market
2007 Real Estate Bubble, Oil hits $100
2009 Start of Sovereign Debt Crisis
2011-15 Japan Economic Decline
EURO begins to crack due to debt crisis
2015.75 Sovereign Debt Big Bang