I guess the nuance is that SBF can get paroles if he behaved well. That is, this 25 years can be punitive, but he will also has a chance to earn some trust and reduce the punishment.
He can’t get parole, but can get RDAP, halfway house, first step act, good behavior (15%), in theory a rule 35b (not sure what he knows), and whatever else gets invented in the future. Maybe a commuted sentence but probably not for a while.
Probably out in 17 years which is still a long time.
I was most surprised by the recommendation of medium security. Not sure how well Sam will do in a medium.
There is a possible "good behavior" reduction, but the maximum of that works out to around 15% off the sentence. He'll serve at least 21 of those years or so.