It's... complicated.
Pre-Disney LucasFilm used a canon tier system. KOTOR was only ever canon to other EU stuff, and only then if the authors cared to reference it, such as Drew Karpyshyn (who was the lead writer of KOTOR, he mentioned it A LOT in his Darth Bane books).
It (and other EU works, such as The Thrawn Trilogy) never had any relevancy to the top tier of canon, G-Canon, because George Lucas didn't work on it. Only the (at the time) 7 movies (OT + PT + animated Clone Wars movie), and The Clone Wars, were truly canon in Star Wars.
Ironically, Disney!LucasFilm made it a simpler situation. It's not canon, but that won't stop them cherry-picking elements of it to become canon. For example, the broad strokes of the Mandalorian Wars are canon, because the Armourer mentions them to Din Djarin in dialogue.
Pre-Disney LucasFilm used a canon tier system. KOTOR was only ever canon to other EU stuff, and only then if the authors cared to reference it, such as Drew Karpyshyn (who was the lead writer of KOTOR, he mentioned it A LOT in his Darth Bane books).
It (and other EU works, such as The Thrawn Trilogy) never had any relevancy to the top tier of canon, G-Canon, because George Lucas didn't work on it. Only the (at the time) 7 movies (OT + PT + animated Clone Wars movie), and The Clone Wars, were truly canon in Star Wars.
Ironically, Disney!LucasFilm made it a simpler situation. It's not canon, but that won't stop them cherry-picking elements of it to become canon. For example, the broad strokes of the Mandalorian Wars are canon, because the Armourer mentions them to Din Djarin in dialogue.



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