I really sympathize. I listened to your video and man oh man.
My girls are soooo quiet, they "talk" a bit in a low (very low) almost purr, buts bout the sum total. The loudest they ever got was when my hen decided to crow one morning, but even that was quiet compared to your hens. Maybe I raised them from chicks and since they werent a part of a "flock" to begin with, they dont know how to be chickens, cuz they really dont make "bok,bok, cluck, cluck" noises.
I feel for ya.