Looks like a recent UI change. The “Yes” button may simply be a confirmation action after suspension, but staff would need to confirm whether it’s intentional or a bug.
A detail that may be useful to those investigating the defect: The unexpected button is only present on the dedicated page for the reviewable (e.g., /review/45721). It is not present on the items in the general reviewables listing page (e.g., /review?&status=all&type=ReviewableUser).