The information was allegedly anonymized, but that's not really the point. He wants this information for a few reasons, the first is to be able to claim what a huge expense it is for the state. Secondly, these states are now pushing to ban gender affirming care for people up to age 25 because it's been shown the younger someone begins a medical transition the better they integrate into society. Lastly, they want to scare trans people back in the closet.