That's literally my point. It is also a heath risk. The last show I did for them had a ton of ln2 and co2 and the cast had to be briefed on how to react in emergencies. And it had a big air-handling system and automatic doors directly to the outside.
The problem might be that if you add a lot of carbon dioxide or nitrogen to enclosed space...often, you would need to cycle in fresh air just as frequently. There is a lot of wind in that scene. But I'd be surprised if they're connected to an external exhaust.
You shouldn't feel at all embarrassed. Disney is a company whose pride is (ostensibly) storytelling. They are failing, at the moment, to be effectively communicating their story and your part in it.
Hopefully, due to its nature, the ride can be refined in the future.