Not to make light of anything, but "isn't huge"?
As of 11 June 2024, CECOT had a population of 14,532 inmates. With a capacity for 40,000 inmates, CECOT is the largest prison in Latin America and one of the largest in the world by prisoner capacity.
https://en.m.wikipedia.org/wiki/Terrorism_Confinement_Center
IIRC they had the fish dicks joke first and then thought about who might have the best/worst reaction to it.