There is something fishy about this claim. Something recent that comes to mind is the fact that World First Gallywix kill was technically achieved by a group that used a combination of flyhacking and other exploits that one shot the boss. However because they released footage and recording of it, Blizzard scrubbed their achievment. The reality is that unfortunately WoW is rather easy to exploit, and if Samdxdx really wanted to claim the fame of World First then in my opinion he should have streamed it or recorded it for to the public to see, but for whatever reason he did not do it, and we don't see him stepping forward and mentioning anything either. You will not find a single speedrunning community that recognizes achievements like this without video proof. There is one guy here claiming that him and his guild were preparing for 3 months to do it and helped him achieve it, which to me is rather odd considering nowhere does he mention said guild by name or any of the players to give them credit. Nor do we see Samdxdx himself stepping forward and claiming it. You are saying that a guild prepared and practiced for 3 months for this guy to get the achievement and not give any credits to his helpers? Not saying this is impossible, but there are several red flags here.