Nope. For accounts created before 2017, if you change the root account's email address it changes the Amazon.com retail account's email address as well. This is documented behavior by AWS[0]:

> If your AWS account and Amazon.com retail account share the same login information, updating the email address or password on one of the accounts changes information on the other account.

[0]: https://aws.amazon.com/premiumsupport/knowledge-center/trans...