To me, "cliffhanger" means that something big is just about to happen/get started.
I'm pretty sceptical of the idea of defining cliffhanger in such a way you don't have to say an obvious cliffhanger is a cliffhanger, so I checked Wikipedia's brief.
A cliffhanger or cliffhanger ending is a plot device in fiction which features a main character in a precarious or difficult dilemma, or confronted with a shocking revelation at the end of an episode of serialized fiction. A cliffhanger is hoped to ensure the audience will return to see how the characters resolve the dilemma.
leaves us definitely qualifies,