The author isn't talking about games though, nor is he really talking about "storytelling." He's saying that the philosophical bent and diversity of the game makes it the most important sci-fi universe. Your argument has a great angle, but as for godless diversity and the insignificance of man, Vernor Vinge has definitely been there before.
Magicians have this unspoken rule that whoever popularizes a trick owns it. Maybe the author, like me, didn't have the fortune of being exposed to Vernor Vinge. But be that as it may, there must be something commendable in how Bioware has chosen to integrate these concepts that Vernor pioneered and package/tweaked and EXTENDED it into something that is palatable to the masses (the new younger demographic at that) I am quite certain they needed to tone down hardcore parts of it for the game to be somewhat entertaining as you can see in their more in-depth exploration of the universe thru novels and comics. The future movie is a result of the success of the game. Hence the concepts of godless diversity and insignificance of men will have reached and incepted more minds. That is why its very important. But 'important' is a very subjective word so disagreement and put-downs are to be expected.