Well, OK, maybe, maybe this is true.
In order for it to be true or not true we’ve got to start wibbling around the edges of what is in fact rape, what is sexual assault and so on. Meaning that if we’re wibbling around these sorts of definitions then we’re about right in terms of orders of magnitude at least.
What’s happening is, of course, that we’re adding the rape statistics for men in prison to the gross numbers for the society as a whole.
To which a couple of things might be added: the state is clearly failing in its duty of care to those that are in its care. Indeed, one way of reading the numbers is that it is the prison guards themselves doing a lot of the raping (according to standard rape doctrine the imbalance of power there makes it impossible that there could ever be a consensual sexual relationship in such situations).
The other is that, well, where are the “Take Back the Cells” marches? Or is it OK that some tax evader gets his bum split but not OK that frat pledges shout “No means Yes”?