The idea of an "unbiased" source confuses me. Firstly, because we are not talking about true historical events. We are talking about a story, the source will always be biased towards the message and theming that the writers intended, that Venat was right.

And second because even recordings in the real world are susceptible to bias - who made the recording, how is it framed, what was ommitted, etc. In terms of in game cutscenes, stuff like music choice, shot composition and how characters are framed when speaking will introduce bias already. And written content will be biased by the narrative voice.

From the perspective of an investigative journalist trying to understand what really happened in the final days, the desire for an "unbiased" source is admirable. From the perspective of someone trying to analyze a piece of fiction, it's baffling.