No, not attain a 700 lbs squat in such a short time, you are right. But he couldve easily gotten a 400 to 500 lbs squat the natural way within 5 years or so, and he couldve done it without gaining hardly any weight.
Anyways, I think we've beaten the topic to death.
For those who still disagree, please read the 2 articles I posted earlier