The three Immortal Emperors did not know Lin Yuan's true realm.
At the thirteenth level of time life, the level of realm is not directly visible.
For instance, whether a time life has comprehended its own Origin Dao... if it does not actively display it, it cannot be determined.
Normally, one can only judge through the strength of this time life. Lin Yuan's previous strength was comparable to an Immortal King, coupled with the comprehension of the Chaotic Origin Destruction Dao.
Theoretically, a First Realm Red Dust Immortal could not achieve these.
As for observing Lin Yuan's past and future timeline? With the protection of a lord's status, even an Immortal Emperor would find it difficult to grasp the full picture, and forcibly peeking would inevitably alert Lin Yuan.
Time lives are very wary of their own past timeline. If the three Immortal Emperors forcibly peeked into Lin Yuan's past timeline, even if they could see what they wanted, it would undoubtedly offend Lin Yuan.
