Why is the ruling of stoning (rajm) applied to the absolutely divorced person who commits zina, even though they may be more exposed to temptation than the unmarried, and why are they called "muhsan" (protected/married) despite not having a wife?

The Sharia (definition) rulings are sufficient for their acceptance, implementation, and the firm belief in their truthfulness. For the ihsan (chastity/marital status) required for the stoning of an adulterer, five agreed-upon conditions must be met: بلوغ (adulthood), عقل (sanity), حرية (freedom), تغييب الحشفة (insertion of the glans), and previous lawful intercourse through a valid marriage. Ihsan is a state formed by the confluence of eight conditions, each part being a cause and a condition for the obligation of stoning. This is because freedom enables a valid marriage, which in turn enables lawful intercourse. The offense becomes more severe after deterrents have been available. Once ihsan is established, the adulterer is liable to be stoned, and it is not required for the wife to remain under his marital authority or for him to be with her.