This is almost true of The Elder Scrolls V: Skyrim. The original version of Skyrim won't come up in a search of Steam, just the other versions (VR, Special Edition, Anniversary Upgrade, and Anniversary Edition). It is, however, still there. It appears Bethesda is just hiding it, hoping...
DynDOLOD Patches 2.45 (Mega) for Skyrim and Enderal - papyrus script patches only need to be updated if DynDOLOD DLL is used. The 2.45 papyrus script patches work with either DynDOLOD DLL or PapyrusUtil automatically. Mods Requiring DynDOLOD - included rules ...