She has no idea what a pressure cooker is or the principles behind how it works. She has no idea that an Instant Pot is an electric pressure cooker. Therefore, she has no reason to think that steam escaping is anything other than the appliance functioning as it's supposed to. And instructions are for losers.This was the other thing that was so astounding about her giving no notice whatever to the screaming steam - that shit is beyond boiling hot, and getting anywhere near it means an instant scald burn. How did she not notice that tons of water was escaping her "stew", or how hot it made the room?
Pressure cooker accidents are horrible, which is why people were so glad when the Instant Pot came out - a nearly idiot proof pressure cooker that has built-in safety features that by and large prevent the types of accidents that made people afraid to use them: it won't start if the lid isn't properly secured; it will auto shutdown if anything is burning inside or if there isn't enough liquid; and it will do the same if there is TOO much liquid; the top locks during the cooking and pressurization process so you can't blow it up. Basically, the only thing you can do to fuck it up is leave the valve open- which is why there are instructions about this embedded into the top of the lid next to the valve. It says that you need to close it, and warns you about how dangerously hot the steam is.
So of course, Chantal fucked up the one thing she could fuck up, and nearly burned her neglected pets.
Honestly, if you gave an Instant Pot to some remote Amazonian tribe who have never had contact with the outside world, didn't have a concept of written language, and who have never encountered beef, stew, or beef stew in their history, they would have had a better chance of making this dinner work than Chantal and Peetz could manage.