I am ok with the fogs on during high beams. It's the dimness of the fog lights that got me looking into them. I just pulled the headlights and looked for any sign of this method - clicky - and no signs of any non-factory wiring.
So, no extra wires in fuse block and no custom wiring between headlights, turns, or fogs.
Odd.
Also, fogs are only 37.5w, but maybe that's normal, looking it up now.