I've had a recent experience like this. Was doing an AP of one I previously attempted to do before (that didn't get far), and while the first go around, we found the key to disarm a trap and continued on. The second group, we found the key again, and the DM said we were trapped, the room was going to smoosh us, and that was that. I, the party's trap disarmer, didn't even get a chance to disarm or whatever. It was clear to me he just wanted us to die for the sake of dying (despite the AP in question being an absolute meat grinder).
The group certainly has AC going for them now, which should last them to the point where they have the HP/toolkits to match encounter difficulty... assuming Adam doesn't start throwing in 2-3 enchantment school wizards in every encounter.