Seems fake. Quoting a comment from the linked thread:

I call bullshit, not only is the rest of your desk dry and pristine which rules out a fire bottle or even water dumped on it to extinguish, the bottom face of the mouse is so intact the label is readable despite the entire top being charred, and the desk and desk pad under the mouse also being melted. It’s also melted and not charred, and it’s melted from the top down not the inside out

All modern usb ports have overcurrent protection and the mouse has a fuse in it, specifically to prevent this exact scenario.

I’m being a bitch here but I think you were playing with fire or a soldering iron and didn’t realize your desk was honeycomb shitboard so it caught way faster and deeper than you expected, and you melted the mouse to see if gigabyte would get you a free desk.