If I'm reading that right, the food science degree applies to auditors working at a CB.
P23 of your link has some other interesting caveats to the degree requirement:
Educational Qualifications
• Auditors must hold a degree in a relevant discipline or have completed a related higher education course.
• Certification Bodies must confirm and retain records of all qualifications.
No Grandfather Rights
All auditors, regardless of tenure, must meet current requirements. Certification Bodies should review qualifications and experience to ensure compliance.
Degree Relevance:
The degree subject must be appropriate for the auditor’s sector. For example, Chemistry and Veterinary Science may be acceptable for scopes A1, A2, and C0, while Veterinary Science is less suitable for C4, and Environmental Biology is generally not appropriate.
Justification and Equivalence:
Justifications for "relevant" higher education courses or "equivalent" qualifications must be robust and defensible, with evidence and consideration of course details including learning outcomes and duration or professional experience.
HACCP Training: HACCP or Hazard and Risk Assessment training must be separate from other qualifications (e. g., degrees) and aligned with the auditor's sector of activities.
Framework Reference: The GFSI Food Safety Auditor Professional Development Framework may be used as a reference for qualifications and training standards.
Then on P24, section 4.11 covers "Scope Extension of Auditor Activities" which appears to allow wiggle room for existing auditors to receive training in a new sector if their prior education isn't sufficient for a new area of activity.
BUT THEN...
I skimmed down to P46, 6.17 for Internal Auditors. "Internal auditors shall meet similar or comparable requirements to those for external auditors, as set out within each Certification Programme Owner’s rules. This shall include, at a minimum, requirements related to internal auditor education, training, work experience or other qualifications. Their qualifications shall be assessed annually by the Certification Body.
Certification Programme Owners may require the organisation’s internal auditors to successfully complete the Certification Programme Owners specific auditor training."
So, if I'm reading that correctly, self-auditing one's company to SQF standard could be updated to require specific paid SQF training courses (whereas current SQF practitioners can just demonstrate proficiency), and possibly the degree in food science.
What a fuster cluck...