In addition to that, it looks like he's touching the probes with his fingers. He could be seeing that reading without touching the hooks at all. On the other hand, maybe he really did find low resistance between the hooks, and the picture is simply a poor illustration.

There are a number of lines in TFA that imply that such technology is going to somehow give better security to wireless communications, but apparently people are forgetting that basically if you can see it, you can copy it:

Information Leakage from Optical Emanations specifically addresses devices that accidentally leak information, but the same principles will apply to information that is deliberately transmitted (in the visible spectrum, or otherwise).

It might not be as easy as eavesdropping on your neighbor's wifi, but the bottom line is that the physical transmission of information in both cases (wifi and visible/optical) is observable from a distance, and therefore both mediums face the same problems in terms of security.

is clearly because someone wanted the worlds largest porn collection!

From TFA:
"there's a lot of porn on the internet, so there's a lot of porn that gets collected when you're archiving the whole internet"