金時習が茶室のルーツ説(1988)という元ネタは、ジョン・カーター・コベルというアメリカ人女性の論文らしいw
アマゾンで「コリアがジャパン文化に与えた衝撃」なる美術史なんかが売られてるな。

amazon
Korean Impact On Japanese Culture -9th Printing ed. Edition
by Dr. Jon Carter Covell

This book probes into subjects still frowned upon in Tokyo;
it explores a few "skeletons in the imperial closet."
A half century ago this subject brought authors to prison or death. Using tools such as archeology,
stylistic analysis, Japan's sacred scriptures themselves, its imperial line is here traced back to Korean origins,
its legitimacy established by an iron sword from Paekche kept inaccessible at Iso-no-Kami) with a gold inscription,
which dates Japan's founding ruler from 369 A.D., rather than orthodoxy's 660 B.C.
"J