The fact is, due to the tag and due to the fact that the article writer has not mentioned it in any way or form in an IC or OOC thread shows that it is not open for OOC commentary (yet), much less an IC one. The only way Yui could have known about the treaty would be if she can quite literally access our SARP WIKI in real life. And since she cant, and since her player can (and clearly has), that is my basis for panning Wes for metagamery.
If I were to use an NTSE Tech analogue, it is like an Yamataian character commenting on how crap Nepleslia's new gun is, when said gun not even distributed, manufactured, designed or exist in any shape or form in universe yet, nor even OOCly submitted to the NTSE for discussion or mod approval, or even completely drafted for first submission by the tech writer.