Okay, but this is simply telling you how to make it clear that you're declining rental car company's waivers/coverage, so that Amex will cover you. It's telling you to write it out, if no other place exists on the rental contract where you are explicitly turning down the rental car CDW. It's not telling you that, if you write "I decline the CDW provided by the Rental Agency," then you get to retain AMEx coverage even if you had purchased rental car CDW with the intention of using some aspect of their coverage.