This former judge had already served about a decade in prison when he was part of a group of non-violent offenders transferred to house arrest during the coronavirus pandemic in 2020.
Republicans wanted to send all those individuals back to prison, and so Biden commuted their sentences to prevent that.
This individual was due to be released in 2026 anyways, so it wasn't like he had much left in his original sentence.
The program was a huge success. Fewer than 1% reoffended during the house arrest.