I'm sure being a wild animal means some level of stress. I'm also sure it is nothing compared to the deplorable conditions in which factory farm animals are raised.

Your comparison feels like talking about soldiers with PTSD and then saying "all humans have jobs and deadlines and they depend on these for their livelihood! All humans have stress, how are soldiers different?"

I have no desire to look for images of how disgusting the living conditions and lives of these animals are in an attempt to prove this, but you are welcome to. There is no doubt in my mind it is far worse than their state in the wild. (I'm not defending the "article" or its findings, just saying that we as a society do terrible things to animals we plan to eat).