The guests who had been in attendance at Lan Yuge's birthday party were all subordinates of the Dongfang family. Also, not much time had passed since then so the news of Gu Ruoyun's current level of strength has yet to become common knowledge. That was why everyone currently believed that she was still a Martial King which was the rank she had attained during her visit to Black Tortoise Country.
Actually, they couldn't be blamed for thinking this way. It hasn't even been a year so who could have imagined that she would have jumped over an entire level from a Martial King to a Martial Emperor?
"Returning to the Western Paradise" is a Chinese euphemism for death.