Some doofus installed a cheap under cabinet fluorescent fixture with a factory installed flat cord and attached the cord by nailing through the center with small brads, went through the EGC so did not light themselves or anyone else up thankfully.
Sure looks like old NM to me (running into a range vent). Not a factory flat cord. And cheap undercabinet fluorescent fixtures that used flat cord weren't grounded until recently. And if it was a grounded flat cord, it wouldn't look like that.
Doofus is right!
Anyway, as we all know, that sort of nail is the proper grounding connection, but if you wanted to tap power, you need to use a drywall screw.
And for the Coup de Grace, the wire around the drywall screw is looped in the wrong direction!