To answer your question, ILAC G8:03 is obsolete. Only the latest version of ILAC G8 should be referenced, i.e. ILAC G8:09/2019 Guidelines on Decision Rules and Statements of Conformity.
ILAC, the international organisation for accreditation bodies, produce guidance documents for assessors, regulators, laboratories and customers on the interpretation of accreditation criteria. As the 2017 edition of ISO/IEC 17025 requires decision rules to be agreed on, when a laboratory issues statements of conformity to specifications or standards; ILAC G8 was revised extensively.