That makes no sense to me at all. (and who are 'they' ?)
It follows logic that the BBC would insist as a part of the rights/licence/contract that the UK Top Gear continue to be shown alongside TGA, not the other way around.
btw, if you look at some of the other crud that TGA's production co have been churning out (freehand productions), it's no surprise it's gone down the gurgler.