I would say: the eldar played very badly. He nearly lost all of his units by staying in range of a LP2. He didnt kick any low Hp units, played the wrong tactic i would say (3guard + bitch), didn't use the big gen on a "big gen-map" and so on...
As IG i would stay in my buildings and during the eldar tries to knock your LP2 with your units in it you tech on vehicles.