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Never forget 3 mile Island and never trust a government official or company spokesman.
Logic, my dear, merely enables one to be wrong with great authority.
My comment about spoiler sites was about the knowledge that Wererats were found in the Underneath City, not that a silver weapon would hurt lycanthropes. The Underneath City part is specific knowledge about an upcoming game; the silver weapon thing is indeed a fantasy norm and can be assumed to be common knowledge by all characters in the game world.
Or, perhaps, he is planning an expedition to follow rumors that the Undercity is infested with wererats or has even been specifically asked to deal with the wererats.
There are many potential sources of knowledge within a game world.
Any fool can criticize, condemn and complain and most fools do. Benjamin Franklin