Food is food and a snake got to eat even those eating other snake. As far as mutation versus normal it would be like people having issues feeding dumbo, hooded or blue rats versus albinos who are commonly used as feeders.....The paint job does not make the animal superior.
Kinked babies, those failing to thrive are often used to feed other snakes, some healthy animals bred as feeders are used to.
In this case the animal used was probably unhealthy or not feeding.
Now taking pictures or videos of feeding is not something I care for whether people feed snakes or rats, it contributes NOTHING, it only gets people upset, whether done on purpose or not and is not the best publicity for this hobby. We all know how snakes eat no one needs to make a show out of it, only those in desperate need of attention.