Chen Ze was in high spirits, it was just a WALL-E robot, after all. He only had to wait for Tony to arrive, and he could ask him to make another one next time—it wasn't a big problem at all.
Moreover, the price Nyarlathotep offered was too good to resist—three wishes, no matter what they were. With such an opportunity, Chen Ze believed that no matter what problem Lafra encountered, it could be resolved.
Chen Ze wasn't foolish. Based on the information provided by Flemea and later Lafra, he could roughly deduce that the entity responsible for the downfall of otherworldly deities must be Nyarlathotep himself.
At first, Chen Ze suspected Hastur, considering the fact that Hastur had the capability, but after hearing that Hastur had immersed himself in filmmaking, Chen Ze stopped pondering over Hastur's involvement.
And when Chen Ze saw Nyarlathotep, he understood—if this entity was also involved, that would explain it.
Speaking of Hastur...