It is the court records for every federal trial, in the US, dude. How much more primary of a source do you want? You will find countless people being released before their original sentencing date for lots of good, legal reasons. Sometimes you find people getting out because they abuse the system. It’s the cost of giving the wrongfully incarcerated some means (or at least the hope of means) of escape and justice.

Like I said, do you know what that website is?