I agree with you on the tone but I think that's obscuring the real point behind the article which is Fred Wilson's advice to developers. The article is trying

I agree with you on the tone but I think that's obscuring the real point behind the article which is Fred Wilson's advice to developers. The article is trying to discredit that advice (which was to develop for Android first). It uses his stock sale to demonstrate a pattern of behavior in which Mr. Wilson demonstrates a bias against Apple because of their secrecy. The article's point is that Apple has continued to succeed despite its secrecy so he was wrong to use that as a reason to dislike the company. Hence they believe his advice shouldn't be followed. That doesn't mean he was wrong or failed on a personal level or as an investor.