A large dump truck hauling company with multiple trucks and employees...

A large dump truck hauling company with multiple trucks and employees also hires subcontracted owner-operators to haul for them. They claim that the sub haulers only need to provide them workers comp policy info if they have more than two employees and trucks. Am I wrong in thinking that this would be handled as payroll even for a single owner-operator since the large company has multiple employees and work comp, if the subcontracto