You should read it yourself. He said those were the best set ups for DC monsters you can't intimidate, (dynamis only) where you're eating red curry buns, (which will cut off about half the money you make, with dynamis currency hovering at 4.5k) are solo, and have no buffs. And even then it's a miniscule boost, in dead content, for 1 single job. And the spreadsheet comparison was done before Adoulin came out, and very much did make the rest of the game obsolete.
Are you seriously so thick as to believe that a piece of equipment that requires you to get another piece of 300 million gil equipment to be made at all useful, in only a single event, that you only do to make money in the first place, and is worse than free gear you can get in an afternoon in adoulin, somehow justifies that dual wield is broken and overpowered, and would take BST from one of the games worst DD's to the game's best? Despite the fact that 4 other jobs can already do the same damn thing and are still looked down upon as too weak?!