I don’t believe you read the article there… he ported zquest an engine remake which you can play with your original ie. self ripped Zelda rom.
For the classic quests that remake original games, they are made in the ZQuest engine so I'm not distributing any ROMs. However, there are some videogame music files which may be ripped from the ROMs (not sure on their origination). And the graphics are obviously taken from the games too.
Although, pretty much every quest uses some sort of copyrighted material (these are fan games after all). Not sure if any of this falls under fair-use.