Those chickens look pretty rough to me. If my smoked chicken looked like that I would throw them away. I see several problems, I do not have that type smoker so anyone that does can correct me, That's a propane smoker, why would you use lump charcoal in a propane? I didn't see a smoke stack either and last mesquite wood. With no smoke stack and using lump and mesquite, lots of stale smoke, you probably couldn't eat the skin if you wanted has to be extremely bitter and creosote tasting. You really have to be careful with mesquite it is a very strong wood, most people I know who use mesquite mix it with oak and use very little, and is WELL seasoned. When I smoke chicken they come out a deep golden brown. Maybe the You Tube lady needs to read some post and see some pictures in SMF, just saying my 2 cents worth.
Gary S