Warren Buffet, a very famous investor you may have heard of, even mentions that he knows plenty of small individual investors who follow many tenets of the philosophy of value investing and they have consistently beat the market.
I, personally, have been individually investing, following the principals of value investing, knowing the companies I invest in, and asset allocation, diversification across industries, and I have slaughtered the market for over 20 years.
All the points he raised in the article are valid, but they read like pop culture one liners. If you are serious about investing I recommend reading Ben Graham's Intelligent Investor and Security Analysis, and follow along with Buffet's letter to shareholders.
Understanding the stock market takes time, and you won't find the answers in a 1000 word blog post.