Is the old man of Six Paths mentioned by Ichio Shokaku really a Sage of Six Paths?

So what is the relationship between the Sage of the Six Paths and the Tailed Beasts?

Yaoguang - Chaldea Headquarters.

Professor Weber narrowed his eyes, and his thoughts raced: "Old Man of Six Paths, this kind of title is obviously more intimate. If the old man of Six Paths that Shouhe said is really a fairy of Six Paths, then it means that the Tailed Beasts and Six Paths Immortals have a lot to do with each other."

"As the aggregation of chakra

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