Looking at Scott's bio he was CEO in Liberia right up until the signing of the major upscaling of operations in Liberia. It would be a natural time for a change of management at this time. After nearly 3 years it would not be unreasonable for a break, especially as this was in Covid times.
ArcelorMittal signs landmark agreement with Government of Liberia; signals commencement of one of the largest mining projects in West Africa :: ArcelorMittal Liberia