Is it correct for the professor of Islamic linguistics to say that one who reads or narrates disbelief is not considered a disbeliever or a polytheist, citing that the Holy Quran is full of explanations of corrupt beliefs?

The one who transmits disbelief is not a disbeliever, as long as he denounces disbelief and believes in its falsehood. This is further confirmed when he transmits it for the purpose of refuting it and clarifying its invalidity. This is an established principle among scholars. However, it is incumbent upon the teacher, when teaching such materials, to clarify to his students that this constitutes disbelief that contradicts the religion of Islam, and not merely to transmit disbelief. Caution must be exercised to ensure that the transmitted disbelief does not contain a subtlety that might mislead some of those weak in knowledge and faith. The Quran transmits the words and beliefs of disbelievers, clarifies what is in them, and guides people to guidance.