Correct. The Zhodani are the ones who embraced psionics and are kind of a Cold War foe for the imperium (or actual foe during one of the Frontier Wars).
Since this pocket is adjacent and allied to the Zhodani, there are more of them around. Most of the Vilani are from independent human colonies, not necessarily from the imperium.
This is just “west” (spinward) of the classic Spinward Marches.