That's a possibility, but the way Geptun and Luke talked about the whole thing in the end strongly implies that the whole Luke POV is strongly distorted by Geptun's 'interpretation of events' as well. Luke is supposed to be the hero of this 'story', despite the fact that he did not feel or think he behaved all that 'heroic'. The brilliant (or interesting) aspect of this novel is the thing that we can't be sure if or what happened 'for real', and it's actually interesting to find out what real Luke really did in the novel, and what stuff clearly comes completely from Geptun. And it's not only Luke we talking about here, it's also the whole stuff about Cronal's POV, and anybody else's. What we have here is really a holodrama script turned into a novel.