[avar]

> And after the game he was unable to explain his own ideas, proposed ideas that were simply losing, referenced games that did not exist, and was generally (relative to the class of player here) clueless

Aside from Niemann's case, how is it strategically beneficial to a chess player to provide the "inside scoop" on his plays?

You're presupposing incompetence, but another explanation would be a deliberate strategy to throw off future opponents.