That's sketchy, but not a MITM since there's no communication to or from a shadow profile. Again, I'm all for privacy and it's unceasing that facebook has profiles of people without their knowledge, but just trying to keep the discourse rational cause I've seen a lot of very sentimental and fearful posts, which lead to an irrational collective discourse, which just leads to chaos and unproductive conversations.
There are Facebook trackers on nearly every website and they siphon data from your friends & family which you have no control over. Yes, yes, I can and do block things via browser extensions and whatnot, but it's simply not possible to stop them from sucking up a considerable amount of data.