This is something that is said so often i don't think people even know what they are saying anymore. If you squat OLY style, you are definately not taking stress of the knee by going atg. Your knees are so flaired in this stance at the bottom it is stretching the shit out of everything. You cannot squat OLY style and sit back completely. At least i have not seen it done. Now a wider stance squat is definately going to take the stress off the knees by going down, but you have to look at the whole picture and discuss different squating approaches, and what you are trying to do.