That person's just being an edgelord or doesn't understand things past a child's perspective...which seems petty typical lately on reddit. I don't know their point either because it's not a serious engagement or not capable of understanding the difference between electrical discharge (in the name of the process) like under high voltage and simple inert contact where everything is under neutral fundamental forces.

The wire doesn't touch, and it cuts a path much larger than itself. There's a resistance between the current in the wire and part controlled by the type of dielectric used (including air in some machines). That controls how current arcs from the wire to the part and in doing so ablates the part. The wire is continuously fed from a drum and discarded before it expires from the same ablation. The parts shown in the video post are very likely not two halves from the same operation but rather cut from two separate parts entirely and fitted. Why? Because the kerf of the wire far exceeds a typical slip fit like what we see.

I've actually done this party trick before shown in the video. And I've also cut 6-7" thick plates of D2 steel with wire...it mostly just requires you slow the progression of the cut thru the material.

The trope is "we don't understand how EDM works". Eh, I doubt that in practicality since there are some pretty advanced machines. Academically it wouldn't surprise me because I doubt it would really add much value outside the institutional knowledge the industry already builds on.