yekke2,
I didn’t read the question that way. To me, he was asking whether there would be any scenarios today which would constitute Mesirah, not whether she believes the Torah came down including a parshah of Mesirah.
That’s a nice spin on the question, but I don’t agree. Here’s why: the question was ridiculous. Not even those who may hold that mesira is “not an issue” in the medina shel chessed would “immediately” call the cops based on a playground rumor. No, the question was meant to be insulting, albeit to dan l’kaf zechus, perhaps unconsciously so.