I discovered a plothole...?

Chapter 1247,

“According to historical records, Jing Miao Zi was a disciple of Shui Ni. This dream realm’s owner is the disciple of Jing Miao Zi, her true disciple. That can only be one person, the water path great expert famous in history, Sea Calming Lord!

In Central Continent’s history, there was an immemorial desolate beast that caused Falling Heavenly River to change directions, resulting in a tsunami that swept the lands. Central Continent’s central area was flooded and the tsunami to the east was overwhelming. Back then, Heavenly Court Gu Immortal Sea Calming Lord stood up and used several immortal killer moves to return Falling Heavenly River to its rightful direction, the sea level returned to normal, he had incredible methods.”

But Falling Heavenly River was created by Bo Qing in the Current Era due to his myriad tribulation while attempting to ascend to rank nine, merely 10,000 years ago, whereas Shui Ni, creator of Sprit Affinity House, and definitely her second generation disciple, Sea Calming Lord, also were in the Medieval Antiquity Era, over 300,000 years ago! So how could Sea Calming Lord correct the course of Falling Heavenly River?

From the wiki,

The source of Falling Heaven River was the place where Bo Qing had perished in the past. According to the Central Continent Gu Immortals' opinion, the river could either be a form of tribulation that Bo Qing had to endure or the result of Bo Qing's sword path killer move that he unleashed during his tribulation, which happened to pierce through the two heavens. The two holes in the heavens connect to a majestic Heavenly River above it.

So everyone agrees that Bo Qing was the cause for Falling Heavenly River's appearance, right?

There is no way the second generation disciple of a person who lived 300,000 years ago could live in the Current Era, that is because even the longest living Venerable, Primordial Origin, only lived for 25,000 years, even he could not cross eras, there's no way this Jing Miao Zi and Sea Calming Lord are crossing eras.

Is this really a plothole?

Also I'm at chapter 1250, no spoilers without spoiler tags, plz.