Re:
Hi
Yes many bikes have curves in the seat tubes, seat posts don't need to go down that far, I think your frame is one of the last made and would imagine few sold, I can find stock pictures of early versions like the one's you have just listed but not the later version you have.
The components fitted to yours also point to a later model.
My concern is that if the Magura brake booster is bent backwards so has there been a problem with the rear shock to allow the rear wheel to impact with the seat tube if so the frame is to be honest about scrap as you would imagine.
I live in Warwickshire