Well, he means this:
The stories were written in a continuity based on the Ghostbusters Timeline I first started writing in 1998, and first posted online five years ago. It's written from the point of view that the first movie and the first season of RGB were the peak of the franchise creatively, but almost everything else since is also counted as much as possible (ie the later, suckier RGB, GB2, the Now comics, EGB, and even 88MPH's comics) to form one semi-consistant continuity (because of the Timeline, it's sometimes referred to as the "GBOT" universe, and has a companion Timeline devoted to it here
I've posted a few fics in my GBFans Profile, but honestly, converting those stories from html to BBS is kind of a pain in the butt. With AJ's indulgence, I'll instead post links to specific stories here every few days until we're caught up to the present.
The latest story posted (I will edit this post as this changes)
June 30, 2020:
Ghostbusters: Picture Imperfect, Part One
January 1989--Timeline Year Seven
While Venkman and Winston are out of town, Egon and Ray get a call from the Manhattan Museum of Art, site of Vigo the Carpathian's recent defeat. Janine, meanwhile, finds herself questioning a lot of her recent activities while Ghostbusters' newest hire, Louis Tully, gets a surprise of his own.
But now let the trip through the archives begin. We start with the very first story I ever submitted to GBN. Ectozone Fan Fic #001:
Ghostbusters: Fateful Encounter
Timeline: 1964/April 1991--Year Nine
Egon Spengler goes on a little trip to the 1964 World's Fair, and in the Mort Weisinger tradition has his "true" first meeting with someone of no small significance to him! Inspired by a scene deleted from Ghostbusters