It was! Great content with plenty of behind the scenes info, a lot of work on the looks/aesthetics of the thing.
If you're interested, Titan reprinted a selection of their articles into 3 volumes a couple of years ago. You can "look inside" a bit with Amazon previews:
https://www.amazon.com/X-Files-Official-Collection-Agents-Syndicate/dp/1782763716/
https://www.amazon.com/X-Files-Official-Collection-Monsters-Villains/dp/1782763724/
https://www.amazon.com/X-Files-Official-Collection-Conspiracy-Secrets/dp/1782763732/