Their wording is very confusing for me - "To opt-out from our anonymization of your personal information to perform data analyses, please provide your Mastercar

Their wording is very confusing for me - "To opt-out from our anonymization of your personal information to perform data analyses, please provide your Mastercard or Maestro payment card number below." To me it sounds like, "we are anonymizing your personal info, but you can opt-out and allow us to perform data analytics using your personal info as it is."