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I picked a random set on Bricklink that had a metallic silver grille listed in its inventory (on Bricklink), and on Brickset its listed as the same colour as above (Laquered, Cool Silver, Drum Laq).
So I'm guessing Bricklink has inventoried the wrong colour.
In general, Bricklink's "Metallic Silver" is equivalent to TLG's "Cool Silver, Drum Lacquered". But since Bricklink inventories are user-generated there are common errors. Any time you see a BIONICLE part listed as "Metallic Silver" on Bricklink, it's really either Silver Metallic (post-2010 pearl silver), Silver (pre-2010, non-2006 pearl silver) or Cool Silver (2006 pearl silver). These timelines are an approximation, of course, since colors are rolled out for different themes at different times and later production runs of sets can often use newer colors than earlier ones.
In the case of this particular set, I imagine either a person with little experience with metallic colors and the Bricklink naming system inventoried the set for Bricklink, or a person who did not actually own the set inventoried it based on the instruction manual/replacement parts database and assumed TLG's "Silver Metallic" was the same as Bricklink's "Metallic Silver",