Oh dear... There is so many things that I would disagree with what Chogyal Namkhai Norbu has mentioned in his article.
For someone that practices Guru Dragphur, a manifestation of Padmasambhava... it does not appear that he has that much of a great faith in Padmasambhava's ability to subdue spirits based on how he explained about Nechung.
What really irk me about the article is when it was mentioned "When these people [indicating Gyalpo practitioners] die they become part of the class of Gyalpo." And we all know that he is referring this to DS practitioners.
So the question is... does this mean that great lamas like Trijang Rinpoche, Pabongka Rinpoche, Domo Rinpoche, etc are all going to be 'part of the Gyalpo class' when they pass? Well, reality check, it didn't happen.
From what I see, I am having two opinion about this... I do not like to criticize any ordained persons nor do I like to criticize another's Guru, but I just have to voice out my opinion on this:
It is either:
1) He is an extremely attained Lama that is involved in this Illusory play of enlightened beings to bring eventual benefit to others, just like Lama Zopa. So perhaps He is showing the world... Look! it is wrong to perpetuate deities to destroy DS, and showing how much negative karma can be collected by disparaging DS as an Enlightened being. In this way, how compassionate He is to use himself as an example for everyone to see.
2) He is used by his centre to promote the practice of Guru Dragphur and they are taking 'advantage' of the situation on DS to draw attention to this practice. I think it is because of this that even Nechung was not spared from being criticized by them.