Not clear if "employees" here refers to the whole supply chain.. this is not explicitly mentioned.

Exact statement:

"We take all reports of potential misconduct seriously and handle them promptly, fairly, and as confidentially as possible. We have established a transparent, open, and predictable process for dealing with grievances. Any grievance, complaint or concern from external parties and employees may be submitted anonymously online or by phone via Cargill’s secure Ethics Open Line, which is operated by an independent third-party and is available 24 hours a day, 7 days a week. Employees can also raise grievances with their manager, human resources representative, and/or through their trade union or employee representative. Cargill will not tolerate retaliation against anyone who, in good faith, raises a concern or participates in an investigation."