The man wasn't lying. Even with the pitiful amount of aura the man had, he was close to becoming an Immortal. Perhaps even just a step away, but Han Mengli was far too weak to be capable of noticing something like that, so he had to take his word for it.
The man started asking more questions about how Han Mengli was getting his hands on the spirit stones when he didn't have a Soul Space, but Han Mengli wasn't about to reveal such a thing without knowing much about the man.
He planned on keeping that to himself, but the man was so persistent that after a few days, he had to reveal it.
He showed the man the spirit stone mine.
The man was surprised at first, and Han Mengli thought he would leave him alone, but the man then began asking how he transported the stones to the room.
After some time, Han Mengli revealed the wound on his arm as well, and how the demons tended to never search there.
