Is this statement true about certification campaigns?

Yes, search-based certification campaigns can be used to review access for non-correlated accounts. Non-correlated accounts are accounts that do not have a direct link to any identity in the system, which means they may represent orphaned or unmanaged accounts. Search-based certifications allow administrators to create campaigns based on specific criteria, including targeting these non-correlated accounts to ensure they are properly reviewed and addressed within the organization.

References:

SailPoint IdentityNow Search-Based Certification Campaign Guide.

SailPoint IdentityNow Non-Correlated Account Management Documentation.