Ashraf Ali Thanwi (often referred as Hakimul Ummat[a][5] and Mujaddidul Millat[b] (19 August 1863 – 20 July 1943) was a late-nineteenth and twentieth-century Sunni scholar, jurist, thinker, reformist and the revival of classical Sufi thought from Indian subcontinent during the British Raj,[6][7] one of the chief proponents of Pakistan Movement.[5] He was a central figure of Islamic spiritual, intellectual and religious life in South Asia and continues to be highly influential today.
clearly he has done his homework and he holds good amount of authority and credibility.
also the wiki page for the university mentions about the doccumentation
Also even in that time you just couldn’t make any girl a slave, this was only for the prisoners of war, you were supposed to share your food and wealth with them and help them in tough works, I am not saying that having a slave is even remotely justified today, but what i am saying is that there is a lot more nuance to it
please see the following linkRecommendations VS LAW (The recommendation is to set a slave free for slapping, but the LAW is an owner will not be punished even if he kills his slave)