No! I´m not the one to tell you how ESD and ESD-protection works..
But to other readers I might explain!
when you use for example a: ESD-wriststrap (and connect it to a bare metalpart in your computer) it will SLOWLY even the electrostatic chargelevels between you and the computer, When you then grab the ESD-bag the wristrap will SLOWLY adjusts all these charge levels to be equal.. (no damage to the component inside the ESD-bag)
And now, when you, the computer and the component (In the ESD-protective bag) all have the SAME chargelevel, that is when you may remove the bag and safely install the component without causing any damage, as long as you keep wearing the wriststrap and it remains connected to a bare metalpart of your computer...
Grounding yourself is always a quick discharge (causes damage), hense it has nothing to do With ESD-protection at all..