Hmm - didn't think of that at all - but I could be in a similar boat: I created a gmail account related to my Cmdr name AFTER I began playing: so while I also still have access to my original account email (another gmail acct that I use for gaming sites in general) it is no longer tied to any of my ED Cmdrs....To perhaps muddle things some more: that email IS still being used for my Steam account login...
My 2nd / main Bubble account - who has had the same email since inception - DID receive the 10 Year Stats retrospective....My third account (back in pre-FC days - I was planning on spacing them more or less evenly around the galaxy for Hull Seal rescues

) HAS changed not only the account email - but also the account name....Did NOT receive the email....(that one is less special than my primary / namesake account so I am not offput)
From my perspective - I would think that the simplest method would rely strictly on the current, active
account email - and not something that may / may not have been filled out on a page of the storefront?