"Story editor" department

Tom: While I don't know the exact details of this occupation, the guide for the Writers Department says:

Staff writers, story editors, story coordinators, story supervisors, story consultants, and dramaturge / dramaturg also belong in the writers section.

https://help.imdb.com/article/contribution/filmography-credits/writers/GPLAT3NTCGA67A6R# 

And the guide for the Script & Continuity Department says:

The script department only includes production jobs - script related jobs for members of the screenwriting staff (like story editors) still belong to the writers list

https://help.imdb.com/article/contribution/filmography-credits/script-continuity/GWM4F5TLGXUJUML3#

(emphasis added)

So John Swartzwelder's credits as a story editor (not a script editor) would indeed be listed in the Writers Department.