That is a 3lb chicken. Cornish cross chickens (which is what they would be using for something like this)would be slaughtered at 9-10 weeks which would make them 10-14 lbs.
So using your ratios above, 1 chicken yields 4.5 lbs of cooked meat, which means 7,333.333333333333 chickens.
It’s substantial less chickens.
Although the amount of harvested meat would be higher because they grind everything into a paste as you noted.
That is a 3lb chicken. Cornish cross chickens (which is what they would be using for something like this)would be slaughtered at 9-10 weeks which would make them 10-14 lbs.
So using your ratios above, 1 chicken yields 4.5 lbs of cooked meat, which means 7,333.333333333333 chickens.
It’s substantial less chickens.
Although the amount of harvested meat would be higher because they grind everything into a paste as you noted.
Also, multiply your number by two because they immediately send the males to the grinder.