It's not like they were eating fine lobsters in prisons.

You know how you go in the supermarket and literally every food is like, dead and cut up and in a package? Vegetable, meat, fish, bread, whatever? Then there is just this one weird tank of living lobsters you buy?

Supermarkets don't just run an aquarium because it's fun or something, they spend the money to do it because lobster rots basically instantly when it dies. Within an hour it goes rancid. You have to buy it live and kill it right before eating. Usually minutes.

Prisoner weren't getting carefully preserved lobsters carefully hand delivered from the sea in climate controlled tanks, prisoners were fed garbage soup that smelled like an asshole from lobstermeat that quickly liquifies into putrid bacterial mush.