I think they meant to do this sooner, that's why the reference is the ProHealth quote to 2010 (assuming ProHealth had good information).
I can only guess that the official corporate structure of VIP Dx was different than that of UNEVX because otherwise it wouldn't make sense to stress that UNEVX is wholly owned by WPI. But for practical purposes, things might be the same as they have been until now. Don't know.