Looks like this stuff is a mixture of Ethylene Glycol and Propylene Glycol. What it will provide is a much higher boiling point so that concern goes away. However, from a heat transfer standpoint i believe you are going to be worse off as Bjorn stated. The thermal conductivity of water is greater than either of those Glycols. So your engine will run warmer but won't boil over. My vote, snake oil.
