Roots have been visible for a long time
Describe the practical conflict: mowing, a walking route, a planned bed or a driveway edge. That is more useful than assuming every exposed root is a disease sign. Tree-care guidance warns that root injury and changes in soil conditions can harm a tree. Before cutting or adding soil, ask whether the space can be used differently or the proposed project adjusted to avoid unnecessary injury.
Notice next: Take an overview showing the root area and the proposed activity. Ask for a plan suited to the tree rather than a universal root-cutting distance.