The only thing the email says about deregistering is in the FAQ section...
Quote:
What if I no longer have one or more of my device?
If you no longer have or use your Kindle e-reader, deregister it from your account today. After logging into your Amazon account, click on the Your Devices tab and select the Kindle e-reader you want to deregister. Click Deregister.
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Nothing says you
have to deregister it, it's just a suggestion.