Psion Barrier nothing more is than raising a wall made of Psions in front of the user. It can only block spells directly targeting the caster, I don't remember it ever being stated that a Psion Barrier could outright block visual targeting itself. That doesn't make sense.
As far as I remember, a Psion Barrier should work similarly to Tomitsuka's contact-type Gram Demolition. It blocks spells that directly interfere with the user, but the user can still be targeted visually by other magicians.
Moreover, even IF a Psion Barrier can indeed block visual confirmation, it has to have a limit. I truly doubt something like that would ever be able to impede a magician on the level of Miyuki.
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"Now, let’s open the curtains on our play.
A hell fire banquet of fear and madness, where even the ashes will be burnt to nothing!" - One of 72 Demon Gods of Solomon, The Demon God Belial
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