I think Jarre himself looks at albums before Oxygene like on some projects, not real albums. Deserted Palaces was made for music library, never for commercial release. This was not released on cd until today and maybe never will so that talks about how much is this important to Jarre. Similar thing he feels about soundtrack Les Granges Brules 28 min soundtrack. How can you translate to yourself fact that he released that in 2011 on cd and not before? I think he himself see Oxygene as real first album. Those two before were just projects, not real albums.... Technicly we cant say Oxygene is first one but it is the first one if you know what I mean. Jarre didnt pay attention to those two before Oxygene at all, this fact tells you everything.