Not sure why you are so skeptical.
There's over a dozen wires in that area -- none of the others have the slightest blemish.
The blown link has no sign of external damage to the insulation.
The melted ends of the copper wire strands are clearly not that way due to being dissolved by acid.
The fan motor is clearly not healthy, and therefore would easily draw too much current if the link were intact.
That all adds up quite simply, not sure why you doubt the validity of what I've stated.
