Oh I actually saw that one days ago, I think it was posted by the creator on the mGBA Discord, mentioning how it was possible thanks to mGBA's new scripting feature.
I forgot about it, but I can surely make it news if desired.
btw i feel this a good time to remind you guys that sea of thieves was made by rare, who also made DKC1-3 and DK64, alongside banjo kazooie and conker's bad fur day
I forgot about it, but I can surely make it news if desired.