He never said it would get more fuel in the cylinder and it doesn't but you squeeze what you got tighter and you will make more power.
The one dude that made the comment "tell the crate guys they don't have enough compression." To that dude I say this with both crate engines being totally equal except I get to run more compression and I will blow your doors off on the dyno.I say dyno because on track you may have a better driver.