The conclusion is that we all need to watch that Saints coach's film. Until then, this discussion is moot.
My conclusion on the PFF stats isn't that they're "wrong", its that IMO its hard to draw any conclusion from them. The "pressures" stat is subjective to begin with, and the OL position is highly tied in to the 4 other OL players and the QB. Its hard enough to decide whom to "blame" for sacks allowed...now we have to assign responsibility for something as nebulous as "pressures"?
I think OL stats in general are a work in progress. I would hope that sites like PFF would understand the limitations of their stats. Sometimes those thinktank sites are beyond worthless in that they draw the wrong conclusion...Bears run game is somewhat mediocre and completely ineffective in short yardage, but Carimi grades out as the best run-blocking OT in the NFL...the conclusion drawn isn't "our OL metrics are wonky", its "Carimi is so underrated!". Saints passing game is the best in the NFL, Bushrod grades out the same as JaMarcus Webb in pass-blocking...the conclusion drawn is "Bushrod isn't any better than Webb!". Completely asinine and antithetical to what is actually happening on the field.