This line will be erased in post production using a software like Adobe After Effect (and not Adobe Premiere as I wrongly stated in my earlier post). After a many tutorials watching and few attemps, it looks like it is possible. I have not yet master the craft, but as a proof of concept, here is the identical video to the earlier post, with some post-production trick on the sim-line.
Before post production (jaw-line visible):
After post production (jaw-line concealed):