I don't know much about the history, but as to how darkpsy was created, to me it's always sounded like a pretty natural progression from some of the psytrance that was around before. If you listen to an album like The Lone Deranger there are melodic elements and there are atonal noise elements; a lot of new-school Goa is what you get if you take the melodic elements, ignore the rest and build from that, whereas darkpsy is what you get if you take the atonal noise elements, ignore the rest and build from that. As to when and where it was created, I have the impression that this had a lot to do with it, though I welcome correction from someone who was there when it happened (I didn't get into psytrance until 2003, by which time Parasense were making darkpsy that could easily pass for something made in 2011).