They will look inconspicuous, other than being a large protruding square black hump on the back of the phone. Nobody will know what they are.
It seems odd that it would be mentioned if there is a camera bump. Who looks at the back of there phone and says 'ah the slightly blue camera lens really stands out
It might mean there is no camera bump for the 3rd camera so it mostly blends into the back of a black iPhone? Unlikely, but possible.