He prefaces the entire thing with something on RPGs, and how the point of an RPG is to assume the role of a character and make choices to develop your character in ways outside combat, and how battle was not the point. The movement away from wargaming roots in an RPG is a Very Good Thing, emphasizing character choice rather than dice rolls. However, by taking all that out of jRPGs, they're no longer Role Playing Games, they're Powergaming Simulators, where the entire purpose is to smash the enemy with whatever you have at your disposal. Therefore, you judge their battle system design versus a wargame, which they have more in common with. And as a general rule, they suck.
The scenarios are all either Monty Hall cakewalks or Revenge of the Asshole DM where they decide to cornhole you for not playing the game with a FAQ. Your entire objective is to Make Numbers Go Up, and with the player divested of any need to concern himself with actual Role Playing, you are relieved of all responsibilities except to build your characters to win as efficiently as possible. Much like in wargaming, where you use your units to win as effectively as possible.
The main difference, though, is that rules for wargaming systems are usually polished far more than jRPG battle systems, allowing for much more interactivity. I'll use CBT as an example, because that's what I'm most familiar with: CBT is on its third set of master rules in 25 years. That's like if Square was just releasing FF3, having spent a decade polishing and refining each game, making tweaks on the rules to ensure balance and writing new rules because they hadn't though of the random scenario some fan came up with. If you're churning out games at a rate that jRPGs are, you don't get that kind of parity that you achieve in a well-polished game setting where the mechanics have been vetted by players to find the weird, game-breaking combinations devs never though of, and likewise, the playerbase as a whole never develops an attachment to a system like they do in pen and paper RPGs (though some do, but they're what I like to call an outlier).