Per the documentation:
and the migration instructions in the next post:
and the Production release info for 1.24.2.4973 (which created the PlexMediaServer shared folder),
— YES, you can delete the Plex shared folder unless you want to use it for other purposes (like media).
The user Plex can be deleted to avoid future confusion.
The installer would have removed both of these for you had DSM 7 not stripped it of all necessary privileges.
