I am fairly certain mansplaining refers to when a person in a position of privilege "explains" to the unprivileged individual "facts" on certain topics that they, as they are in a position of privilege, are uniquely unqualified to explain. Specifically sex privilege. Cissplaining, straightsplaining, and whitesplaining have more of this sense than the following sense: When a male explains to a female (usually condescendingly) something that they assume the female (usually knowing this thing) doesn't know (usually because they are female).

I don't know how that fits with your proposed instance of hypodiction. Unless ME knows how to solve Problem Z and their knowledge is specifically related to the concept.

But yes, that should be a word.