She claims so, but she also spoke out loud about a medical condition and her desire to live. That is something the tree explicitly promises.

[ He's not sure either but he isn't writing out the idea just because Firefly claimed so. Neverah lying until the end kind of proves it to him that indeed, confession is the outlier. ]

...Lust, gluttony, greed, envy.

[ Those are going to look hella wild. ]