He was brought on board to help create art for NMS comic for special edition. He was brought on board with another writer and both worked on the comic together, they also had a hand in the lore but to what extent is unknown and unsure if gibbons just provided art for the comic or if he helped with conceptual and story stuff too.
He’s most notable for working on the Watchmen graphic novel with Alan Moore.
Thats all I know from top of my head.
Edit :here’s a link to a story about it
And here’s a direct link to the official video on no mans sky lore released before the game launched