Could you post the link to that website that talks about it? I can't say unless I have read that article. Normally rubber is an excellent electrical insulator; and as such it would help prevent electrical current between dis-similar metals. If it is a specific type of rubber that they are concerned with it might be the reason for the recall.
Carbon exists in many, many non-conductive things; it is the type of carbon bonds (at the molecular level) that would determine it's conductivity. CF probably has some conductive properties; but you would have to be attached to the roving directly because the plastic that encases it is non-conductive.