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What on Earth is this-how are people supposed to work this out if they have no idea who these people are?

I think it's a kind of weak joke?

Because of the personal content and because it's not published as a general-interest quiz, I gather it's part of a private puzzle hunt with a murder-mystery theme. You might have noticed the non-Puzzgrid-related clue in one of the explanations, and that same clue has appeared in all three grids by this user. (The setter is probably trying to make a clean one without any outside comments, but the setter probably doesn't realize his/her own comment draws everyone else's attention via the comments page. As a courtesy, I'd suggest we refrain from commenting on this user's puzzles that aren't publicly posted.)