He is literally asked this question:
And he literally responds with this answer:Was the “legendary Super Saiyan” Freeza feared the Super Saiyan God that appeared in Battle of Gods?
This means Yamoshi was the one and only SSGod before Goku and Vegeta. You can probably consider Yamoshi’s spirit itself as a Super Saiyan God. There is no unknown SSGod from Planet Vegeta and his interview debunks it.In a certain sense, they are the same person. That is to say, very long ago, before Planet Vegeta was the Saiyans’ planet, there was a man named Yamoshi who had a righteous heart despite being a Saiyan. He and his five comrades started a rebellion, but he was cornered by combatants and became a Super Saiyan for the first time, though his transformation and fearsome fighting style shocked the other Saiyans. Outnumbered, Yamoshi eventually wore himself out and was defeated, but this was only the beginning of his legend. Afterwards, Yamoshi’s spirit wandered in continuous search of six righteous-hearted Saiyans, seeking a new savior: Super Saiyan God.
[Tori-bot] “And that’s why there’s that ceremony to become Super Saiyan God.”
Heck, Super even mentions that the Namekians recorded the legend of said SSGod. And in the interview, Toriyama even mentions that and Elder Namekian records Yamoshi’s story in the Namekian Book of Legends. Maybe that’s how Piccolo becomes important again?