In that quote you provided she said there is no wrong ending, not that there is no bad ending. Those are different things. Romeo and Juliet has bad ending - doesn't make it wrong. While there is no happy ending, there is clearly bad ending in e33. Your title is wrong or intentionally misleading.
Im not sure if agree with no good or bad ending. One ending is clearly objectively a worse ending than the other. One is sticking your head in the sand and the other is about having strength and moving forward. Both are excellent endings sure, but one is objectively the better ending
Players were deeply affected by the different endings of Clair Obscur: Expedition 33, and numerous theories began to emerge. But recently, the lead writer decided to speak out on the subject.