You don't need to know more than the other market participants to do well in the stock market, you just need to know one thing that other people don't (assuming your investment is a tiny fraction of the money in the stocks you pick). You should always expect that all the information on a product that is accessible to Wallstreet traders is already factored into a stocks price, but there may be things (does this product really make sense for someone like me who lives in a small appartment, how will this inovation interact with the stuff I learned in all those technical courses I took in college) that you might better information about than the market makers.

Of course, it might just be that random chance has caused the author of the post to do badly in the market and me to do well - causing us both to be biased. You should always diversify your investing and its probably a good idea to put most of your stock money into index funds.