To quote Abraham Lincoln: "Do not trust anything you read on the internet".

I know it from my own experience and that of many others who have been through the gauntlet. Take it for what it's worth, I'm not selling you anything. I don't look impressive on the whiteboard, but I do have a rather impressive track record. Something doesn't line up. :-)

FWIW, as far as I recall there was another experiment at Google where they tried to establish correlation between interview performance and job performance, and as far as I recall, there was no meaningful correlation. This, of course, is not fully representative, because it does not include poor whiteboard performers.