Here we go again. The slow build up to weapons of mass destruction. Well worn playbook in action. Lovely. :)
They used an whetstone on an anchor and published? (already patented)
Here's the actual article, it's stupid to think it's a tool for war -
https://x.com/CollinSLKoh/status/1903575276539588788
The only reason you'd want such a clean cut is to put it back together.
It's already trivial to cut cables, this is why no one does it on purpose. It's like using nukes to trivially kill solders, it goes both ways.
This reminds me of another piece of news I recently came across:
Five Chinese satellites practiced 'dogfighting' in space, Space Force says(https://news.ycombinator.com/item?id=43433717)
we shall fight in space, we shall fight under the seas and oceans...