It could be interpreted that Osborne is looking to move the stadium land on. I wonder if his recent planning change for that land has been pushed back?
It's the fruits of the nice Mr Russell's labours in playing the viability card and stepping aside to leave a clearer path.
Removal of the covenant leaves the greyhound position in their own gift and leaves them able to cease them and leave the stadium to rot until the council relent - which they will.