That is not optimal gemming. With optimal gemming you get to exactly 1400 arp with tossks and vereesas dexterity - with tear and without +10 arp gem.
This is optimal setup imho(worked the best for me - rawr file):
https://www.dropbox.com/s/03618wi6xjgc5id/fury.xml?dl=0
There are mistakes in the post you quoted about gemming - 2 regardless meta and 1 general:
1. he counts that you get socket bonus, but forgets, that you loose some str to get it.
mixed gem = 10 str + 6 str from socket bonus
full str gem = 20 str
--------------------------------------------------
you loose 4 str before talents/buff by going for chaotic
2. Agi from relentless is buffed by GBOK -> it gives slightly more crit.
(3.) He also suggests to get hit cap by gemming 1x 20 hit gem and 2 x 10 hit/10str gems -> that is also suboptimal - best way is to use 3x 10hit/10str to get all the socket bonuses possible.
Therefore Relentless meta is better.