If this is your goal then you should train accordingly. Just curious, what do you do in real life that requires you to move 700 pounds around with any regularity?
He teaches BJJ which requires as strong of grip as he can possibly have for opponent control, as for his job beyond that I do not know.
I know some farm workers and mechanics who use such a skill on a regular basis, it may not be 700lbs but that wasn't the important part of that post. As you may or may not know #s relating to plates of iron on a bar are not directly transferable to other activities like lifting odd objects and such, not saying they don't help but moving 700lbs on a bar isn't the same as moving an engine block, a fridge, a big stone in a farmers field etc.
It depends on your goals but a little more focus in that area would help even if it only means bigger forearms for vanity.