Does anyone else think that they've lost control of this vehicle and that's why, despite it having re-entry capability, it isn't doing a lot of re-entering?
The article claimed that it's sibling stayed in space for over 400 days before reentry, so no I don't think that's particularly likely.
No, it has repositioned and changed orbit repeatedly - while it may all be classified, much like other classified satellites, there's a horde of amateurs watching and tracking.