What "allowed" means here
Answers are phrased as "allowed by the supplied rules". The cluster may have other bindings, default ClusterRoles, group memberships such as system:authenticated, or other authorizers. Roles referenced but not supplied make the answer unknown rather than denied.
Aggregated ClusterRoles are filled in only from supplied ClusterRoles whose labels match. They are always marked partial, because controllers and operators can add matching roles at any time.
Questions
Can it read my cluster’s RBAC?
Not directly. Export the objects yourself, for example with kubectl get roles,rolebindings -A -o yaml, and paste them. Run the redaction tool first if the export contains secrets.
Which permissions are flagged as risky?
Wildcards, reading Secrets, escalate/bind/impersonate, pods/exec, and creating workloads. Creating workloads lets a subject mount any ServiceAccount or Secret in the namespace.