With @kepler1 on this one. This is an overly-dramatized Instagrammer's take on a pretty low-stakes situation with plenty of leeway. I'm not even particularly outdoorsy and I've got crazier stories (involving bears, pulling people out of overturned cars, etc.). I was out kayaking this weekend, and even though we were just barely 2 hours out of LA, we were acutely aware and tracking smoke/fires in the San Bernardino Mountains.
With that said, hiking into a high-risk area with already a few known fires nearby is just stupid and it could've been really bad. I'd like to hope they learned their lesson.