Federal institutions have a national menu that they’re meant to provide. I’ve linked to it elsewhere and if inmates don’t receive it then there are avenues to complain through. And to be clear I’m sure even in the best of circumstances the food still sucks, but there is a menu and there is choice. It is also VERY clearly spelt out in the MDC Brooklyn inmate’s handbook on page 13 what the food is and an inmate’s options regarding it and any religious / dietician exemptions.
IMO this is SBF being a precious entitled asshole in prison thinking he’s above the conditions that everyone else in there is subject to. “Oh look at poor me I have to eat bread water and peanut butter”. Meanwhile reality says he’s lying. This is merely the latest incident of him attempting to control the narrative. He can’t tamper with witness so he’s holding a pity party and we’re supposed to care.