The answer to this may be given in several respects:
First: In the sources I have consulted concerning his biography, I have not found anyone who accused him of Shiism.
Second: Even if he had some inclination towards it, that would not constitute discrediting criticism, provided that he was trustworthy—and he was. Al-Samʿānī described him in al-Ansāb as one of the firmly established, trustworthy narrators.
Ibn al-ʿImād mentioned in Shadharāt (3/87) that he was a Quran reciter, knowledgeable in Arabic, well versed in hadith, and distinguished in worship.
Third: In al-Maṭālib al-ʿĀliyah al-Musnadah (2/188/2), al-Ḥāfiẓ Ibn Ḥajar likewise attributed the hadith to Abū Yaʿlā. In the introduction, he stated that he transmitted Abū Yaʿlā’s Musnad through Abū Bakr al-Muqriʾ, from Abū Yaʿlā.
Ibn al-Muqriʾ was a trustworthy, dependable hadith master, and thus provides strong corroboration for Abū ʿAmr al-Ḥīrī.
This invalidates Ibn al-Jawzī’s declaration of the hadith as defective on his account.
- As for the hadith of Thawbān, Yazīd ibn Rabīʿah narrated it: al-Ashʿath narrated to us from Thawbān, with a similar wording.
Al-Ṭabarānī recorded it in al-Muʿjam al-Kabīr (2/92/1425).
This Yazīd is abandoned.
- As for the hadith of Saʿīd ibn al-Musayyib, al-Shādhakūnī narrated it from Yaḥyā ibn Saʿīd, from Sufyān, from ʿAlī ibn Zayd, from him, as a mursal report with similar wording.
Al-Khaṭīb recorded it in al-Tārīkh (9/44).
Al-Shādhakūnī was a liar. Thus, the report of Abū Hurayrah is the main basis. And Allah knows best. *