It is not that the power of the spirit is already sufficient to traverse the universe; rather, this connection is based more on the mysteries of the Starlight Holy Tower itself.
In the vast star vault stands a blue seven-story pagoda, its aura ancient and solid. It has flying eaves and carved railings like a painting.
A strand of spirit descends among it, manifesting its form.
At the time, the Star Tower was erected directly beside the Jade Balance Stars, skipping the most tedious and dangerous step of building the Starlight Holy Tower. There was no need to risk the spirit getting lost in the universe to establish an anchor point, nor to gather the starlight power bit by bit to build the Star Tower—after all, Senior Guan Yan had completed it with a slap of his hand.
Now this Starlight Holy Tower is indeed still within the conceptual inner realm of the Jade Balance Stars' star vault, but the "body" of the Jade Balance Star occupied by Senior Guan Yan is unknown where it has gone.