The translation was originally done by someone, but it was never released. I think the guy said "finish this so I can distribute it via repro" and then paid the hacker/translator/whoever the fuck. It was released much to the anger of fat neckbeards, so they were like haha uhh lets just dump the rom? So they did, then they were like haha let's just rip out the translation and distribute that for free
So that's what this is. It works fine (so far) on my GBA Flashcart (EZ Omega using Goomba)