They look fine and healthy to me, and probably bored. My 4 Easter Eggers are literally at my basement door, so if I open the door (or even pull back the curtains to peek outside) they'll run up their ramp to the "porch" of their house so they're about waist-level with me and do that growling noise. If I then walk past them out into the yard without stopping, they start with the loud yelling. It's different from the egg song, more of a "Hey, you just walked past me without talking to me!! Come back here!" I think they just like to talk, and with yours just now starting to lay, this may indeed be a lamaze class.
It looks like they quieted down when you got there to readjust the camera, then started right back up. I used to give mine treats to shut them up, but then was afraid they were playing me and/or training me to give them treats when they got loud, so I stopped that. Good luck with them.