يَحْمِلُ and يَنْفُونَ are present-tense verbs: one refers to carrying/transmitting knowledge; the other to removing distortions. In عَنْهُ, the pronoun هُ points back to that knowledge.
Sound teaching has two sides: transmitting accurate material and protecting it from confusion. Keep three elements distinct in study: the original Arabic wording, its faithful meaning, and an extra illustrative example supplied for understanding.