The user has zero edits by the way, so I wondered why he even got a talk page. Looks like someone moved a main namespace article to that place in 2016:
User_talk:Cactus_Dragon?action=history&redirect=no&offset=&limit=500
This seems to be the case for other user talk pages as well.
This one is not even a registered account, but has a talk page:
Message_Wall:Chameleon_Dragon
User_talk:Chameleon_Dragon?redirect=no
User_talk:Chameleon_Dragon?redirect=no&action=history
So for some unknown reason, on June 12 2016, User:PerezSchool moved a whole bunch of main pages to the user talk namespace.
See their history: Special:Contributions/PerezSchool
/edit: Most of them were moved back to main namespace by a SOAP member a week later, but not all. There are 5 pages left, they show the "current" tag in PerezSchool's history.