The spoilers never said where it was supposed to take place, but if you watch the ep and watch the scene, it's pretty clear that's what it is. They removed the entire scene in a chunk, then cut to Logan's "Ah, young love" reaction with Meg walking past them.

The "singing" part was something that was speculated by fans based on Duncan's weird movements in the original promo (which didn't make it into the episode). We weren't exactly sure what he was supposed to be doing.