Miao Miao's appearance might be attributed to some sort of human experiment, but the Primitive Planet is quite unfamiliar to All-Star. People know that the food ingredients come from the Primitive Planet, but that's about it—beyond that, they have no clue.
If the fact that Miao Miao comes from the Primitive Planet gets exposed, people might start letting their imaginations run wild, which is bearable. But if those wild imaginations lead to actions, like capturing Miao Miao to do something, then Du Xixi would really be frustrated to death.
To protect Miao Miao and the Primitive Planet, Miao Miao's origins need to be kept secret.
Most of the audience in the livestream are fans of Sun Mulin. Those who joined later came because of Du Xixi, and both their fan bases are decent. After all, fans follow the idol's lead. Seeing Du Xixi being vague and Sun Mulin staying silent, they didn't bother about Miao Miao's identity and origin.
