I wouldn't call myself an expert, but that is not related (factually) to an event being available, but (by rumour) to an exhaustion mechanic that was later removed. The only NPC we ever meet with the exhaustion effect is a bird in the grove. It's a debuff and notable nerf to classes like barbarian, where every rage builds up exhaustion. The result of critical exhaustion is death. Of course, we don't have that mechanic in the released game.
Well there is no barbarian in my party. I did not take track of who asked for longrest and which specific condition he/she was, if any. I just ignored them.
Btw devs could totally consider to switch that random comment from whatever it is triggered by now to an (surprise surprise) event available in camp
