Can losing significant amount of weight reduce a crater deformity that was a result of botched gynecomastia surgery? (photos)

Thank you for the question and pictures.
Unfortunately there is no way other than surgery to reverse the concavity that has developed of your nipple areolar complexes. This arises when the vast proportion of the breast tissue, including the disc of breast tissue directly under the NAC is removed at surgery. The only real way to resolve this is to release the underlying scarring and to place a small amount of fat graft under the NAC to build it back up and give it a platform of tissue to sit on.
I wish you luck.
Marcus