Relax there Doc, no need to get upset.
Your instructions say to move your head basically against the window to adjust the driver side mirror, and move your head over the center console to adjust the passenger side mirror. In doing this both mirrors are mis-adjusted for when your head is in the normal driving position. Not to mention there isn't a car made which has zero blind spots. You might as well stop trying to convince me at this point. That car has been gone since I traded it in for a WRX in 2012 LOL.
I'm not upset, I'm trying to explain this to you and rather than respond to what I wrote you're responding to what you are imagining.
Just try it and you'll see. I know, you've been setting mirrors your whole life. Maybe accept that sometimes something you've done your whole life may still be improved upon by trying a different method. Try it on any car or truck you're currently driving, it's not specific to Camaros, it's just a bigger benefit there because of how big the blind spots are for "normal" set mirrors. I have set every patrol vehicle I've had like this as well as every rental car since learning to do it. It's great in heavy traffic or during emergency driving because you don't have to shoulder check your driver's side blind spot like you otherwise would and can keep your attention more forward.
If you don't like it and it doesn't work, what are you out except resetting your mirrors?
You move your head only while setting the mirrors and you move the mirrors exactly as I described while in that position. You obviously won't see the same view from the neutral position as you did when you had your head moved for the process.
That's ok, it's part of the process. Then when you return to neutral the mirrors are set to completely eliminate blind spots. Yes, completely. There is nowhere a car can be and not be level with your natural peripheral vision and not be in either your rear view or side view. Since I learned how to do this I've set every car I've driven and every half ton or smaller truck I've driven like this, and demonstrated it to many many others. It does *not* work on lifted trucks nearly as effectively on the passenger side, but still works on the driver's side pretty well.
When you first do it, you'll think the mirrors are set too far out. You're used to seeing the flank of your vehicle in your mirror. But try it and you'll never go back to just adjusting them with your head neutral.