Relatively speaking, inside the aircraft, which is what we are talking about,
We are talking about this Ethiopian 787, it was not flying, it was sitting on the ground for over 8 h. So if you want to make your comments relevant try to limit yourself to this scenario. On the other hand if you speculate about humidity in flight at least understand environment and Physics because your 15% becoming all of a sudden 57% and your 6000 ft pressure "differential" is totally bogus argumentation.