Cant comment on that guy in particular, dont know him, but in general I cant say I have ever heard of any get rich quick scheme that offers high rewards with little work to be of much use.
Logically though, I find it hard to swallow that what he says is accurate,
Its pretty unheard of for adsense to pay out the sums of money he is talking about for low traffic sites, to get good results with adsense, you tend to need to do a *lot* of hard work.
Either hard work setting up excellent quality sites, and seo'ing hard, relying on quality over quantity or hard work setting up a network of spammy sites ,relying on quantity rather than quality.
I know if I had a method that could get nearly 20 thousand dollars a month out of google for 10 normal sites, I would not be wasting my time making video's and selling the secret to everyone, I would be setting up more and more sets of 10 sites to get more multiples of that 20 thousand dollars a month. After all, if its as easy as he reckons, he should be a billionaire by now...