I won’t answer the specifics because the other poster did. It’s completely normal for him to be on oxygen. He got it while tubed, and likely did for a short while after, that’s how it works.

These kind of medical issues aren’t simple, I had to go to school, take lots of tests, get certified, work for years in the field and in the hospital setting. When people say stuff like this that is completely objectively wrong and everyone here takes it as fact, it makes the entire movement look really, really fucking stupid.