Letter is pretty standard. Just chatting a bit honestly. Gonna write him back and send him some record reviews he asked for.
FWIW my wife was unreservedly in favor of my writing him and was psyched to see a response.
Re: his request for some specific record reviews, despite his letter coming from a literal prison, the saddest part was that his lack of internet access means he doesn't know how bad Pitchfork has gone downhill in the last 3 and a half years.