The tool, which is able to cut lines at depths of up to 4,000 metres (13,123 feet) – twice the maximum operational range of existing subsea communication infrastructure – has been designed specifically for integration with China’s advanced crewed and uncrewed submersibles like the Fendouzhe, or Striver, and the Haidou series.
That seems less concerning to me after reading the article.
It’s concerning that they are developing the capability (which can be used in multiple ways) in the same way that any geopolitical rival developing capacity that competes is concerning, but “dogfighting” evokes the idea that China is planning to fly around and blow stuff up, in an irresponsible, Kessler syndrome-inducing way.