Really not veryrelevant at all.
1) This was well over a year after Onyxia was released, and 3 raiding tiers on. Not 2 months after EV is released using basically same-tier gear (this looked easy enough that it would also be possible in full Columi not just full Rakata).
2) Onyxia had no enrage, plus healers at this time were using downranking tricks + naxx gear to heal forever (not intended by bliz, they nerfed it just before TBC (or was it at start of TBC?).