While not all solo raids are a DDO first (Titan is not, for instance), some of them are, notably the Abbot. The Abbot (with the puzzles, w/o is not worth mentioning) had previously been considered impossible to solo because at least one death was required. The Angelic ED capstone was available to everyone, but Shat was the one who was able to make a plan around it and execute it successfully.
Certainly Shataan is the first in the game to have solo'd ALL the raids!
Gratz again, Shat.