I went to check the EXIF data on the image to see what software he used, but in the process accidentally found out the image has text layer metadata in it:
View attachment 1526191
Pretty much all the text in the PSD is in here, including some interesting lines that are not in the final image (probably on a hidden layer). Here they are:
· Add Guns
· Normal NPCs affected
· Lethal and non-lethal
· Recreate in-game 4Chan
· In-Game Donate Button
· Add DLC Only Areas
These are all near the other lines for the PRE-OSANA CHECKLIST section, though it doesn't make sense for some of them to be there.
(I used
https://exiftool.org/ if anyone wants to look for this kind of stuff in other images)