Relying on the Teacher

In this section of The Great Treatise, Tsong-kha-pa refers to gurus having a deep understanding of the three scriptural knowledges.

Would this refer to the Tripitaka?

In this same section, he states that Buddhas and sages do not wash away "others' sins with water".
Instead they "accurately show the path".

Would this be a reference to Pure Land traditions?