Just like what Dondrup say, the Dalai Lama and the CTA had been consulting an unenlightened protector, in other words a spirit. With this, how could they be banning the practice of Dorje Shugden saying that it is because Dorje Shugden is a spirit, people should not practice his practices.
If this is the case, they should immediately remove Nechung as the state oracle as well. Because Nechung is a spirit. Hence, with them not doing so, their argument is invalid as they too consult and practice practices of unenlightened protectors or spirits.