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I think the better report to look into will be Lompac(southern california)[1], they have the higher % of infected prisoners, I think its been roughly 70% of the prison population has tested positive for covid. Analyzing these closed systems for a true death rate seems to be the only way we will get decent data regarding mortality. I don't see govt. officials going door to door in cities asking for people to prick their finger to analyze for covid antibodies. A few things to watch out for is prisoner transfers due to extreme sickness, also getting a age distribution for the prison like others have said here, another thing to note is prison food and env. is bad on health.

[1] - https://beta.trimread.com/articles/14963