no, it is safe.
apply TRUE, FALSE TO THIS QUERY.
THIS EXPRESSION (~EMPLOYEE) IS FALSE IN EVERY CASE.
HENCE THE REMAINING EXPRESSION HAS TO BE TRUE, NOW IF THE EMPLOYEE IS MAN. THEN THE WHOLE EXPRESSION BECOMES TRUE AS THEY ARE JOINED BY BINARY OR OPERATION
BUT IF THE EMPLOYEE IS FEMALE THEN SHE CAN NOT BE THE SUPERVISOR
OTHER HAND, IF THE EMPLOYEE IS MALE THEN NO NEED TO CHECK OTHER CONDITIONS.