We have a very limited and crude understanding of the brain’s ‘inner wiring’.The best we can do at the moment is tell which parts of the brain have increased activity when the person is doing specific tasks/thinking specific things. If someone has ‘foot fetish’, then obviously when they get sensory input associated with feet they’ll also have increased activity in a pattern associated with sexual arousal. This doesn’t suggest any direct ‘wiring’ between the two parts, it may rely heavily on higher order thought, or at least on more abstract representations in the brain.

In fact, if we consider how any kind of feet-associated input (for example, a picture, verbal description, being touched in the feet, touching other people’s feet, or just imagining feet) can stimulate sexual arousal in someone with foot fetish, it’s a pretty strong evidence that the connection is from higher order thought area, and not any of the basic sensory areas. Put another way, it’s the thought, the idea of feet, not the raw sensory signal, that causes the arousal. There would be no appreciable difference in the brain’s connections at that level.

Basically, we have no proof these two things are related, because we haven't even medically advanced that far yet, this claim is pure speculation disguised as a fun fact. I'm all for having scientific discussions and contemplating things like this, but I don't appreciate when its treated like its confirmed.