Even though I love and respect Fr. Pfeiffer, I suppose he will probably blow a gasket upon reading this EC, and use it as more ammunition to attack Bp. Williamson. However, he will be dead wrong on this.
I was taught in my catechism that there are three things necessary for a Sacrament to be valid:
Proper matter
Proper form
Proper intent
So, therefore, a valid consecration certainly can take place in a N.O. Mass, though it may be increasingly less common due to the abuses and state of things in the N.O.
I also know that God is Almighty, and He can work a miracle wherever and however He sees fit.
So, anyone who wants to "bray" about Bp. Williamson's letter really needs to pipe down, IMO.