History of Nightfall Ruins

Nightfall Ruins appears in game data as a The Crucible-typed entry with the description "Freehold Outskirts, Mars" (Freehold Outskirts is a region of the Lawless Frontier on Mars, introduced with Destiny 2: Renegades). No source I could open (Destinypedia's Freehold Outskirts page does not mention it) documents an activity by this name, so it is likely an internal or placeholder activity definition rather than a player-facing Nightfall. It is not the weekly Nightfall strike playlist.