Was Uthman ibn Mansur a Salafi, and did he oppose the scholars of the Da'wah for personal reasons?

Question:
May Allah reward you, Honorable Shaykh. A questioner says: Recently, some of the books of Uthman ibn Mansur were printed, against whom the Imams of the Da'wah, Shaykh Abd al-Rahman ibn Hasan and others, issued refutations in his time. We hear some people say that his creed was Salafi, and that the disagreement between him and the scholars of the Da'wah was for personal reasons. Is this correct?

Answer:
The man has died and is left to what he did. The refutation of him exists. If he repented to Allah, Allah accepts the repentance of whoever repents. So we do not deal with the dead. We do not know about their final state. Yes. And the one who says it was for personal reasons—how does he know that it was for personal reasons? He speaks about tawhid (the oneness of Allah) and praises shirk (associating partners with Allah), and you say these are personal reasons. If it were for personal reasons, he would speak about people. He would not speak about creed. But with this, the man has died and is left to what he did. Yes.