Unity: Oculus Spatializer still appears under settings after dll files have been deleted

Recently I have imported the new Meta XR Audio plugin into my project to use as the spatializer and tried to delete the old legacy Oculus Spatializer however Oculus Spatializer still appears under Project Settings > Audio > Spatializer Plugin after dll files have been deleted. Nothing is in the project that should be linked to it so I am confused as to why it is still showing.