If he was sentenced to 25 years in 2010 why is he released now?

Mexican drug lord who founded ultra-violent Zetas is released from US prison

https://nypost.com/2024/08/31/us-news/mexican-drug-lord-osiel-cardenas-who-founded-ultra-violent-zetas-is-released-from-us-prison/

By 

Reuters

Published Aug. 31, 2024, 3:17 a.m. ET