What is the position of the scholars regarding Muhammad Abu Zahra's description of Ibn Taymiyyah and Muhammad ibn Abd al-Wahhab as severe and violent in his book "Ibn Taymiyyah: His Life, Era, Opinions, and Fiqh"?

Shaykh Muhammad ibn Abd al-Wahhab, the renewer of the twelfth Hijri century, restored the people of Najd to Tawhid (monotheism) and the Sunnah after polytheism and innovations had spread among them. The effects of his call extended beyond the Arabian Peninsula, bringing people out of the darkness of ignorance and the worship of graves and living beings.

Shaykh al-Islam Ibn Taymiyyah was a scholar and an imam among the imams of Ahl al-Sunnah wal-Jama'ah. He resisted innovations and fought imitation and stagnation in his era. He confronted and refuted philosophers, Rawafid (Shiites), Batiniyyah (esoteric sects), deviant Sufis, and fallacious theologians, and he fought the Tatars.