that is not what WPCSA sent to me when I was in this very same situation not long ago. I had a pony who was, obviously, of pure welsh breeding but no paperwork trail and they said a DNA test could provide a sire or dam sire, etc but not a solid pedigree, so therefore you would have a place to start (since all reg welsh stallions are DNA tested and filed now).
As stated earlier, you cannot register the pony based on DNA results but if you could at least track the sire down; you have a starting point on who to go to.
I never did go through with this as the pony was sold before I went through with it.