Well, he ain't totally wrong, just incomplete. It is a totally different piston with a new skirt coating as well.
The squirter delete is probably most of the reason for the power increase, because stuff like that creates a lot of windage in the engine, particularly at high rpm. That and minor tune tweaks probably account for it.
2014 Premium GT, SGM, Brembo, Auto, Tech, Comfort, etc. GT500s, Steeda UCA, VMP auto tune, 100 shot on BBR tune, best et: 11.38 at 120.85
2012 GT, Candy Red, Brembo, 3.73, Tech, Comfort, etc. Procal tune, Roush upper, UMI LCAs, Steeda red bracket, GT500s, 28X10X16 Hoosier slicks, best et: 11.91 at 115.23 RIP