Certain parts contradict only so they don't spoil the story, and even then you'll often find that don't actually contradict each other so much as they say "It looks like..." or "It seems as though..." but doesn't actually state things as fact.

The analects are certainly not hard evidence to anything, though, no more than such things are in the real world.

However, to say all of the DataLogs should be dismissed is to render them utterly pointless, and I think doing so only makes one look like a fool.