No, termina is seperate to that of hyule. That is confirmed. But termina being a oppisite hyrule with terminian couterparts is fan fiction. When will people realise they were to lazy to make new NPCs and that the what they were talking about in the quote was only Skull kid and Link!!!!!!!
Zelda has alwayes been family oriented. The only way they could have it is if they put ZSS in the T-rated area like TP, which I doubt. China created the gunpowder in the middle ages, but that does not apply to zelda because they made their bombs by studeing the Bomb Flower, not gun powder.