It is a legitimate settlement, but my watch is not one of those earlier models so I did not receive the email that includes the Notice ID and Confirmation Code. Apparently you can confirm your payment information by entering that information. It does not say you need to provide any personal information and it wouldn't hurt to enter the ID and Code on this page to at least see what it says about your payment information on file. I understand the hesitancy in entering any account information and not sure if I would be willing to do that either if it was required. It may also give you another option for payment, but I am not sure as I don't have the Notice ID to enter.
https://watchsettlement.com/submit-claim