Even though Charlette has escaped, and that girl has already seen the current form of the Demon King and understood the terror of the Demon King now—she is very likely to mobilize all of humanity and even form another alliance to crusade against the Demon King, turning the world upside down to seek out the Demon King's whereabouts and once again slay the Demon King.
Yet the Demon King's demeanor is so calm. She said she was serious about concentrating her efforts on the vineyard in the coming time.
A vineyard in such a remote small town would in any case not attract attention, and for the Demon King's own ambitions, it's even more insignificant. This person has the desire to rule the world, yet is so interested in such a small vineyard, expending a great deal of effort.
This definitely isn't about concealing identity; if the Demon King wanted to hide her identity, there would be better choices.
Mohe did not explain anything to others.