Carrying the specialty goods from Giant Ring Star and a few bottles of Kidney Treasure Pills made by his elder sister, Lin Shen went to visit Coach Mu. As they spoke, he subtly hinted that there might be an alien invasion of their home planet and urged him to make preparations, especially for his family.
The reason Lin Shen didn't directly disclose the details to Coach Mu was that if this matter leaked now, it could potentially be discovered by the Ultra-Burn Tribe, which might lead to unforeseen complications down the road.
Telling other people wouldn't serve much purpose either—there were only a few Nirvana Beings left on the home planet. Most who could leave had already done so, and there weren't many individuals left who could offer real help.