How would Tohya even know about the underground tunnel and that the gold was there? And what about all the correct hints to solve the epitaph that are mentioned in EP3?
He probably added his own memories to the format used by Yasu.
When you consider that Eva in 1998 has the ring and that Tohya said he's been told by someone about Kuwadorian and the military base, it becomes extremely probable that the epitaph was solved in Rokkenjima Prime.
The real question is why after writing a story that was closer to the truth (at least Eva survives) he decided to write forgeries that progressively gets weirder and weirder. Or at least that's what we can speculate, we don't actually know how much the messages and the forgeries match with the stories we read.
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