No store in the world offers a "nicht registrierte Gastbesteller" option.
The "Guest Checkout" option involves the standard registration of a customer account with the store, including all personal and address information. The only difference is that the customer does not have access to their account.
Shopping without registration would mean that, during the checkout process, the customer would not provide ANY personal or address information, and a psychic employed by the store would provide all the customer information needed to complete the delivery. Such stores do not yet exist anywhere in the world.
Many fraudulent stores mislead customers by labeling this option as "Shopping without registration" or "Shopping without creating an account", when they should provide the correct information: "Shopping without access to your account".
Additionally, in this "Guest Checkout" option, everything is in violation of the General Data Protection Regulation (GDPR).
In the "Guest Tracking" option, the customer also logs in to view their order. The customer logs in using their Order Reference and Email address.