> I think I understand what an oxymoron is and does
You clearly don't, or you wouldn't have mistakenly thought that phrase represented an oxymoron.
> "The Air India flight 171 passenger survived just fine after visiting the hospital."
No need to introduce a completely arbitrary sentence in some attempt to justify your mistake. Just accept that you were wrong and try not to make that mistake again. It's easy.
"The Air India flight 171 passenger survived just fine after visiting the hospital."