I cannot imagine that the TC is John Meadows. He has his own account here.
As for the question about grip strength, anything can benefit your grip strength as long as you are holding onto something heavy for a long period of time. There isn't anything terribly magical about the kroc row in that regard. As with most things, give it a try and see. If it's just a 100lb cap, I would seriously consider packing an Olympic DB handle in your gym bag and using that. You could work up to 150lbs pretty easily that way. I've use it in the past.
I like the one arm barbell row and the meadows row for sure though. Great movements.