Was Al-Hajjaj ibn Yusuf Al-Thaqafi a Muslim, and what were his pros and cons for the believers?

Al-Hajjaj ibn Yusuf al-Thaqafi was a governor of Iraq, known for his tyranny, shedding of blood, denigration of the early Muslims (Salaf), and transgression against God's sanctities. Scholars have agreed that he was one of the most tyrannical people and the quickest to shed blood. He was a Nasibi (one who harbors hatred for Ali ibn Abi Talib) who disliked Ali ibn Abi Talib and his household. Horrible statements, the outward appearance of which was disbelief, were narrated from him, and he either repented from them or persisted in them. He was eloquent, articulate, and a حافظ (memorizer) of the Qur’an, and he used to recite the Qur’an every night. He practiced religion by abstaining from intoxicants, frequently reciting the Qur’an, and avoiding forbidden acts. He was not known for engaging in illicit sexual relations, but he was quick to shed blood, and the greatest criticism leveled against him was his shedding of blood. He was keen on Jihad and conquering lands, and he would give money to the people of the Qur’an. He did not leave behind much wealth after his death. He had extravagance and hastened towards falsehood, coupled with persistence in malice and envy, and he killed a large number of people. A group of imams considered him a disbeliever, while most scholars did not consider him a disbeliever, and some Companions prayed behind him. He was neglectful of prayers, being excessive in their abandonment. He was tyrannical, oppressive, a Nasibi, malicious, and a shedder of blood, but he possessed courage, initiative, cunning, shrewdness, eloquence, articulation, and reverence for the Qur’an. He has good deeds that are submerged in the ocean of his sins, and his matter is with Allah.