Its not. The guy is known, he is popular, and he happens to work in development, so people are interested to know what he thinks. Thats it. You are the one making this a confrontation because somehow you feel attacked by his not agreeing with you. Are you so incapable of articulating a coherent argument refuting his post that the only thing you are capable of doing is attacking the man's curriculum?
We get it, you think that no one but the WoW lead dev is qualified to comment on WoW developpement (because everyone else just dont do quite exactly the same thing or isnt as successful financially), and you refuse obstinatly to actually adress his points. Now that you have made this clear, I shall repeat myself:
Stop this childish ad hominem argument, will you? If you have no comment to make about his ideas and opinions, then you have nothing to bring to this conversation, it really is that simple.