To what extent is what was stated in the book "Civilization of Slaves" by Abd al-Ra'uf Awn true regarding the removal of the حرمة (prohibition) of some women uncovering their heads and displaying their adornment, based on the idea of the awrah (private parts) of slave women?

The book points to an attempt to reconcile the rulings of Sharia (definition) with a deviated reality. The author believes that many Muslims, even sons of sheikhs, do not adhere to Islamic dress, and that some writers object to Sharia. The author attributes this to ignorance of the religion, the closure of the door of Ijtihad (definition) (independent reasoning), and the interference of politicians. The author claims to have found that the Sharia of slaves is suitable for these individuals whom he describes as "slaves in the guise of free people." The response expresses astonishment at the author's description of Islamic jurists as "memorizers who do not comprehend," while he describes those who object to Sharia as "famous and reputable." The book focuses on the idea of "applying the rulings concerning slaves and bondsmen to the general populace," which has led to permitting a woman to uncover her hair and arms and sing to non-mahram (definition) men. The book is titled "The Civilization of Slaves and the Alternative System for Marriage," which refers to temporary marriage (Nikah (definition) al-Mut'ah). The response points to the author's contradiction in stating that his ijtihad is fallible and that he is not responsible for those who follow him, while he authored and published it. It questions the reason for authoring and publishing the book if the author is not among the scholars of the Ummah or accredited fatwa (definition) bodies.