It looks to be a fully grown adult so I would have to say no it will never be completely normal. Given the proper diet it may gradually flatten out a bit but it will take a pretty long time. This doesn't necessarily mean the tortoise is unhealthy, just that it could use some better care. If you're interested in purchasing I would say check it out in person and check for other health signs like clear eyes and nose, clean vent, strong walk/gait, good food response etc and go from there.
