According to Real Fighter Magazine, it's true. Click on the picture of Kurt Angle below to see what Real Fighter has to say.
EDIT: THE LINK IS RIGHT NOW.
You wanna enter the MMA ranks? No manual on the market will show you the training techniques you need to use in order to get there like Diesel Crew's "Building the Ultimate MMA Athlete." You've got to see how Diesel Crew trains for punching power!