These are just egregious cases. The stock market as an oracle is thoroughly overrated. BlackBerry, the late 90s market bubble, the mid-00s financial products bubble... stock price movement says less than you think it does.
Whenever you see many people (not just this author) talk about a company's "financial engineering" you should be concerned they might cross that line; couple that with an explicit pledge to double earnings/share to $20 by 2015 and the danger should be apparent.