That is a load of nonsense.
If that's true, what is the need for face protection?
Why arent people shooting eachother in the eye for fun?
Explain to me why I saw someone having a bb dug out of their face with a scalpel by the medic?
Because the rep was shooing over 500 fps.
I'm an AAC activist and I've studied the legality of airsoft in many countries. England ruled that so long as the projectile contained less than 1j of energy it was safe and could cause no permanent damage even to the soft tissue of the eye.
I can 100% tell you that face masks are for legal liability reasons, and that loadout is just for milsim effect.
Above the 1j limit you could get hurt, if you don't take the propped saftey precautions.