Thread incoming. I've been thinking about this since it was posted this morning and trying to work out how that astonishing statement could be made. All data used by me here is from Ministry of Justice sources and the ONS.
The article states "officials forecast that numbers of trans or non-binary prisoners in England and Wales could rise to 1,000, up from 139 last year." The wording is somewhat deceptive - my initial inference on reading that statement was