Really? I would argue that somebody who has put millions of dollars behind his views has more authority than somebody who has put zero dollars behind them. He has a lot of money on the line. I'm pretty sure he's thought this through thoroughly.
No, he's an investor, who understands the concept of risk. He's made a bet that the value of companies he's invested in will increase, and it may or may not come to pass. His opinions on his investment however, maybe largely biased.