But orthonormal, your example displays hindsight bias rather than confirmation bias!
I interpret billswift's comment to mean:
GlaDOS, you should not just seek confirmation of the legitimacy of the text; you should also seek refutation.
(Or possibly it was meant the other way around?)
In any case, I agree that billswift's comment is off-base, because GLaDOS' comment does not actually show confirmation bias.
From the final chapter of his new book Cowards, titled "Adapt or Die: The Coming Intelligence Explosion."
The citations for the chapter include: