So? Photography is fun. My photos don't exist until I take them.
Nexus Mods didn't delete it. The creator took it down themselves.
It's a gif of Data from TNG saying "Do you consider your position so weak that it cannot withstand a debate?"
Studies and surveys of what? That some animals look different based on sex? Go ask some ducks.
Oh, I did a dumb. Capacitive readers use the body's natural electrical signal to form an image of your fingerprint. You can trick them by using something conductive and running the right amount of electricity through.
Dead people don't work though. Not for very long at least.
Your body doesn't all die at once. The parts that need a constant flow of oxygen die within minutes, while some parts take hours. Tissues like skin, tendons and heart valves are viable for harvest for as long as 48 hours after death.
https://australian.museum/about/history/exhibitions/death-the-last-taboo/decomposition-body-changes/
I don't know how long a fingerprint would work after death though. I imagine it depends on the type of scanner. An optical scanner would probably not care. I'm not sure about ultrasonic. Thermal and capacitive would probably stop working within minutes of death.
It's definitely possible. Most pro cameras can take a picture in 1/8000th of a second. At that speed a handgun round would only travel about 2 inches.
The main factor is luck though. This shot would be pretty much impossible to get on purpose.
Horse hearts are massive compared to human hearts. They would just die. 
Smaller, independent slaughterhouses are closing in favor of larger, more industrial ones. The bigger ones are more efficient at the cost of animal welfare.
I'm glad you didn't have to experience that.
It's still unethical to give people this advice without explaining possible risks. They very much can go after their money if they feel like it.
They CAN make you pay them. They can go as far as garnishing your wages if you just ignore them.