Faerûn is a fictional subcontinent, the primary setting of the "Dungeons & Dragons" world of "Forgotten Realms". It is described in detail in the "Forgotten Realms Campaign Setting" (2001) from Wizards of the Coast, and various locales and aspects are described in more depth in separate campaign setting books. Around a hundred novels and several computer and video games use the Faerûn setting.
The inconsequential place of Faerun is talked about sometimes in the D&D lore
Faerun is a primary setting and has tons of games, novels, and books about the continent. It in by no means inconsequential and is talked about often, not 'sometimes'. The model probably wasn't sure if D&D meant the same as Dungeons and Dragons