I agree that the beginning of the article does make sense to me, well the bit which says:
I have a body and I am more than my body. I have emotions and I am more than my emotions. I have a mind and I am more than my mind. I am a center of pure consciousness and energy. Until those with Depersonalization Disorder learn to move past their minds, they will never be free of this disease. This is extremely difficult for the depersonalized individual to do because their personal sense of identity is so deeply ingrained with their mind that their own internal resistance to this process is tremendous and overwhelming"
My interpretation of this is that essentially people with DP are stuck in their heads and their identity is primarily concerned with their thoughts and mind. I first thought everbody was like this until someone pointed out how different people place their values on different aspects of their being/consciousness, for example think of a native tracker/hunter who lives in the depths of the Amazon. What is important to such a person is their feelings, intuition and environmental awareness, all thinking is placed lower down on the importance scale and as such people dont place their identities in their heads and as such are much more at harmony with nature and the world.
From this viewpoint you could say that DP is a consequence of modern, industrial society, which places such importance on the mind and intellectual ability and as such is cut off from the natural world and is gradually destroying the environment.
You could say that DP is an exageration of the philosophical thinking of Descartes who famously said "I think therefore I am". DP also shows in the worst way how wrong this philosophy is, but the problem is that western christain life is largely based upon this philosophy. I dont agree that it is a life sentence but the sentiment that you cant think your way out of it is one which I have learned the hard way. Eckhart Tolle goes as far as to describe thinking as a modern disease and is one of the greatest barriers to any sort of personal harmony or enlightenment.