I think we may be talking at cross purposes here. I don't think you have understood my post at all. The problem lay not so much in what he was 'given' but in how he chose to interpret that information.
Well let's say it is a combination of the both:
1. Was he told the whole truth - Yes or No?
2. Did he interpret what information he had in an honest and reasonable way, Yes or No?
But the process starts from:
1. Was he told the whole truth - Yes or No? Without that he can't be expected to be correct in the next step but we can still ask ourselves did he work with what he had adequately?
He felt he didn't receive the whole truth. I remember phrases he used like "faked abduction" etc which suggest to me he at least thought "Was he told the whole truth - Yes or No?" was a NO.
But can that stance be backed up here for we are not allowed to say anyone is lying but that is what he is implying. Who would have been lying so that GA becomes correct?