In my opinion:
- $1000 to buy the source code copyright? Wow, no. That's way too little. Not like I'd ever give away my copyright like that (if I want to I'd do it from the beginning).
- Localization doesn't work like that. Even if we assume the worst case that the game is hardcoded, it's still the original developer who usually ends up with the reprogramming burden, the localizator only bothers with the data.
So yeah, I'd say this is a scam, either somebody looking to commit fraud or somebody looking for a developer naive enough to let go of their games and avoid having to develop anything.