I think this is less about IQ and more about culture. (And probably not even about looking down on other people.)

The comment makes no mention of the word "smart", just that Google's interview process is long and hard.

It's hinted at by saying that the author feels better about himself now (implied superiority). Whether the particular trait that he feels superior about is "smart" is left up to your imagination!

I heard about the game of life, but I couldn't tell you the rules or describe it exactly. I never bothered to look into it. Judge away!

My interpretation would be that he saw Google-employees as omniscient demigods, and now has a more realistic view.