Who is Hassan bin Ali al-Saqqaf? Is he a Sufi? And to what extent are his criticisms of Al-Albani in the science of Hadith valid?

Hasan (definition) Al-Saqqaf is a person who mixes and confuses matters in creed, and he has insulted scholars who adhere to the methodology of the Salaf, such as Ibn Taymiyyah, Ibn Al-Qayyim, Al-Albani, Ibn Baz, and Ibn Uthaymeen, describing them as anthropomorphists (mushabbihah), corporealists (mujassimah), and hashawiyyah. Scholars have warned against his writings, such as: "Aqeedat Ahl Al-Sunnah (definition) wal Jama'ah" (The Creed of thenah and the Community), "Bahjat Al-Nadhir fi Al-Tawassul bil Nabi Al-Tahir" (The Delight of the Observer Regarding Seeking Intercession Through the Pure Prophet), "Al-Ighatha bi Adillat Al-Istighatha" (Relief with Proofs of Seeking Aid), "Ilqam Al-Hajar lil Mutatawil ala Al-Asha'irah min Al-Bashar" (Stoning the One Who Exceeds the Bounds Against the Ash'aris Among Humans), and "Talqih Al-Fuhum Al-Ariyya fi Nafy Lafdh Ayn Allah wa Adam Thubutihi fi Hadith (definition) Al-Jariyah" (Immunizing the Bare Understandings in Denying the Phrase 'Where is Allah?' and Its Lack of Authenticity in the Hadith of the Slave Girl). A number of scholars have refuted him, including Sulaiman Al-Alwan, Ali Al-Halabi, and Abdul Karim Al-Humaid.