Will gladly add some clarity!
Wen an account is created, it is automatically on the mailing list in question. However, those who opted-out of that correspondence (i.e. requested no e-mails from CCP) will of course not receive the e-mail message containing the stats. To be re-added to the mailing list, you can send in a support ticket and they’ll get you sorted 
Note: If you’ve gotten e-mail messages from CCP, you don’t need to opt-in, you’re already on the mailing list and it’ll be automatically sent.