Do you really think that someone who can squat 500lbs suddenly becomes weak on the 6th rep?
Do you not think that someone who is used to squatting for 5 reps might take a couple of weeks before they’re accustomed to squatting for 10 reps?
This is one of the dumber questions I’ve seen on this forum. If you put a tiny bit of thought into this question I bet you could answer this yourself.