When you see claims that the Takenouchi Documents or related PDFs have been "verified," it usually stems from misunderstandings or fringe research: Lack of Original Evidence:
: The original documents were reportedly seized by the Japanese government during a 1936 trial for "Lese Majesty" (insulting the Emperor) and were subsequently lost or destroyed during the firebombing of Tokyo in WWII. Current versions are mostly based on transcriptions or memory. Linguistic Analysis takenouchi documents pdf verified