Mo Lingqiu was indeed duping Jiang Xiaonu!
Of course, he was not lying about the Green Eagle King. He was just exaggerating the problem. For example, they themselves could build the big array formation although it would be a little troublesome for them. Still, it would be worth it if the Eagle Empress would owe them a favor.
Once Jiang Xiaonu went back, she would definitely… not come back out again. At least, in the short-term, she would not be able to make it out on her own. A few years later, Jiang Xiaonu would probably forget about Jiang Yi, wouldn't she?