@AviraDeArah
“It is 100% true, emes veyatziv. It has no mixture of non-jewish ideology, or personal bias.”
But you are ignoring the times that Rishonim/Achronim point out the influence of outside sources on their Torah like the Gra about the Ramabam in some areas as well as personal biases such as the Pri Chadash sometimes arguing that the Shach’s critiques of the Taz sometimes stemmed from “מרוב חפצו להשיג על הט”ז”.