Aksai realized many things about his life in general after hearing Naisha's explanation.
He understood that it wasn't a mere coincidence that the meteor stone was brought to Cavereach City on the same day he was attending the auction event. It wasn't a mere coincidence that he had obtained the lost scrolls from a long-forgotten sect.
Why did he get his hands on that pendant and Bloodfiend manual in the antique store? Why was the 3rd-order cultivation cave discovered after he claimed ownership of the Emerald Cove?
They might all be fabricated coincidences.