That is just a lamp holder screwed into the fan J box cover and they drilled 2 holes in the cover, no bushings, for the fixture wires. They used a regular 1/4-20 screw, not the 1/8 NPT threaded tube so they could not route the wires up that way.
One of their house warming gifts was the listed fan light kit of their choice at the home store.
I wired them in a real closet light but we left the water heater alone. I know the 6-20 plug and the Romex is not right but water heaters don't last that long here and we will fix it when they get a new one.
