Why does the standard report User and Role Access Audit Report exclude the seeded BUYER role?

Summary: When running the User and Role Access Audit Report, I noticed that the seeded BUYER role is not present

Content (please ensure you mask any confidential information): This is an AUDIT INQUIRY from our external auditors

Version (include the version you are using, if applicable): 23D

Code Snippet (add any code snippets that support your topic, if applicable):