In the future era, there is an internet term called information cocoons.
Certain news might cause a massive storm within specific circles, but elsewhere, it's silent and unnoticed.
The most famous example of an information cocoon is a fan group reporting the Zi Qing Pavilion for using gutter oil.
Li Mumu in the Real World can be described as unknown; many who know her might only understand her as the daughter of a real estate tycoon.
But in Hell, the name of her and her two plastic besties has become well-known.
This is mainly because Mephisto's meticulously prepared plan was disrupted.
Try speaking to an uncultured demon about the Heavenly King Divine Sect of twenty years ago or the Lord of Flesh and Blood of a hundred years later. Demons don't understand such matters. Not to mention ordinary demons, even Mephisto himself suffered from being unfamiliar with local history and culture.