May be i'm wrong but are you under the impression that Tatsuya wanted to use the magic that is effective against Psion-armor but he is unable to use?
Because if that's the case, the LN would state "...so long as Tatsuya scan not utilizing attacks through the Idea..." IMO.
But he "held onto... handicap..." => he can do that but he doesn't want to.
Spoiler for ”trivia”:
Quote:
Originally Posted by Nandesuto
Attacks made directly through the Idea would be effective. In other words, Tatsuya's innate specialty. This clause appears to imply that something like Trident (the 3-part Decomposition magic) would be effective."
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Trident is not a specific spell. But the name of the technique or "combo".
The "trident" that is mentioned is: 3 "decomposition"-type magic that is used together utilizing "loop cast" of Silverhorn CAD. Tatsuya used "trident"-style bio-shockwave against Hattori in vol1 so it doesn't need to be a specific "3-decomposition-magic".
Like i said before, which magic that is used is not important.
The important thing is: whether that magic can be delivered to the intended target.
We all know that magic has no distance limitation, theoretically. But the magicians who wield the magic have.
The prime example is the one I provide before: Miyuki theoretically can destroy Parasite with her magic. There is no limitation beside her target identification. Only when Tatsuya provided E-sight, she destroyed them.
The problem with normal magicians when they are up against Tomitsuka is that: the can precisely differentiate his body and his armor and can only deliver magic sequence in his proximate area=> dispel by his psion.
Even Miyuki can't not target internal gun parts to stop it from firing.
But Tatsuya is different, he can precisely see and cast magic inside his body=> Can't be dispelled.
Just like a wall can protect the city from outsider, but can't protect it from a Trojan horse.
That problem differentiates Data Fortification and Psion Armor. Even though both can only defense an object from magical phenomenon, but Data Fortification and the object is one entity (as a reinforced object) while Psion Armor and the object are 2 different things.