How should this issue be answered?
As he gazed at the floating Qingping Sword before him, Yu Yuan's mind raced with thoughts. In the end, he did not tell the truth but instead brushed it off with the Heavenly Demon Forbidden God Curse, claiming that a minor hiccup had occurred while studying it and that everything was now fine.
He said this, not to cover up for Saint Zhunti, nor out of fear that it would affect the relationship between Jie Sect and Western Sect, but simply because he feared that if he told the truth, Sect Hierarch Tongtian would directly erase the Great Dream Heart Sutra from his mind.
Sect Hierarch Tongtian valued him, his disciple, very much.
This could be seen from the fact that he had personally come to check on him.
If he found out about the Great Dream Heart Sutra, he would surely remove the scripture that nearly "harmed" his disciple and then go to Sumeru Pure Land to seek an explanation from the two Saints of the Western Sect!