Just fixed mine, sure enough it was off. I did it without removing the wipers; I just turned the car on so the wipers were straight "up." I shut the car down and maneuvered the cowl (one piece) enough so i could pull off the deflector, put on RTV and reattach the deflector. I tried to take the wipers off but they would barely budge. When I was finished, I just turned the wipers off and let them set in the down position, and whacked them a time or two with a mallet and tightened the bolts down. I don't remember removing the wipers when I had to do the same thing on my Impala, either.

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2004 Impala SS - ZZP PCM, 3.4" Pulley, K&N CAI, TOG Headers, SLP Cat-Back, 180* thermo, Autolite 605s, PRJ Performance wires, Alternator rewire, GMPP Handling kit
2000 Grand Prix GT, Commuter Car - K&N CAI, GMPP Handling kit, ZZP downpipe w/U-bend delete, ZZP Plog, Alternator rewire