Based on KOTOR, Traya is casually killing nearly twenty elite Sith assassins without gesturing. A feat well beyond Dooku's measure against numerous opponents.
Based on Revan, Meetra lost to Darth Nyriss, a Sith Lord with greater feats of Force lightning than Count Dooku, on a dark side nexus.
Based on SWTOR, Darth Traya's spirit is a Sith Entity more alive with the Dark Side than the likes of Darth Baras.
You realise the KOTOR engine only allows so many animations at a time? There are countless instances of that happening. So I imagine the scene they ended up releasing was as many dead animations as they could get without an engine crash.
Even so, the script itself is far more accurate and reliable than the game itself. They're both Legends, thus both are just as valid as the other, the aforementioned reliability heavily favors taking the script into consideration over in-game cutscenes.