The belief in Gaia or, preferably, panpsychism isn't necessary to construct or understand an artistic piece. A romance can be communicated by sound that doesn't mean the sound is the romance. Noveria is, in a base sense, a computer program. The art is in what it being communicated by that programming. All the elements come together to convey a theme. In the case of Noveria, it's the Ice Queen.
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As to the isolated. Perhaps Emotionally Isolated would be better. There is a distance between the Ice Queen and the rest of the world not imparted from their worldly status which isn't a necessity to be an Ice Queen.
I think you're overthinking it... I don't honestly believe that BioWare, at any point, had to act like a Fine Art student and attempt to justify their work with pretentious, tenuous explanations as to their "motivations behind the piece". I was a Fine Art student - it was never enough to say "well, you know, I kinda wanted to see what would happen if I just welded that lump of metal to that one, stood back and see what it looked like" (even if that was the truth) - you were expected to provide some sort of emotional or rationalised reasoning behind your work ... it was BS then and I think it would be BS now if BioWare did try to explain their game that way.
I think you're seeing something that isn't there - endowing something that's little more than comic book pulp fiction, made into a game, with some kind of overarching, cohesive, philosophical intent. There would have been an artistic vision of course, but I doubt it would have gone beyond "hey, this would look cool with snow!" ... and, you know what, I'm much happier with the honesty of that.