I'm a little skeptical about the statement you quoted. It's a little vague to have any real meaning. You really need to make a comparison based on some real numbers. Also, leakage is almost always measured as current, not power. Granted, power is the product of voltage and current, but if the current is up 10%, while the voltage is 30% lower, the power will be lower. As such, I'd really want to look at the rest of the article your two lines came from before putting a lot of stock in it.
Also, leakage current is usually pretty small compared to switching losses for high frequency logic. So i must ask, what are the actual operating conditions for the comparison?