I had a look at the paper cited there because I got really curious.
The paper itself seems a bit off, with them testing 1600 men and about 550 women, of those 60 being "Elite National Athletes".
The repeated claims of testing "Elite National Athletes" that perform in "Sports that train high grip strength" without actually backing it up seems weird. They also draw incredibly broad conclusions from that data.
Now, that data and conclusions can very will 100% represent the truth, but seeing as how the paper has next to no attention and there are no further studies trying to prove or refute the point, I'd not use it to make a strong point. A solitary study is practically worthless, after all.
Can't be arsed too look over the data more closely now, but it's a ten years old study conducted by mostly close-to-military guys with practically no notable credit (except for Ridder, that guy is pumping papers out like a motherfucking machine, it seems), I really can't be arsed at 2 in the morning.
I'd love to see more science done on this, though. Couldn't find any more studies on the fly, though.