Judging from the looks of Wen Zhong, Guan Longzi thought of the possibility that the Lady Mother of the Chariot could still be around in the Netherworld. But he was unsure if her existence at the Netherworld was her true form or just an incarnation.
Besides that, the Lady Mother of the Chariot had always been very mysterious and very few people knew about her origins. It was a coincidence that Guan Longzi was one of the few people. The Lady Mother of the Chariot was a supreme existence in the universe, one could only imagine how reputable her honored master was.
The honored master of the Lady Mother of the Chariot was Lingbao Tianzun who was one of the very few people who was fully detached and was of the levels of Daoist master and Buddha. If Lingbao Tianzun was still around this universe, he should be able to feel Guan Longzi's thoughts about him.