The reason why Zhao Hai was telling che Xiaoliang all this was because he really wanted to take him away. He wanted to treat che Xiaoliang as his own disciple. Even if he returned to his body in the future, he would still treat che Xiaoliang as his own disciple.
However, Zhao Hai also knew that it wouldn't be easy. Zhao Hai was very clear that it would be difficult for him to leave the spiritual world. Zhao Hai had already discovered that it wasn't that simple to leave the spiritual world. The spiritual world wasn't just a single plane. It should have a huge space formed by multiple planes. The reason why he said that was because he only discovered it after he arrived at the spiritual weapon world.