It is a bit of a leap. They are saying that if you are using uv, then you likely have a broad set of dependencies because you require a dependency management tool, therefore you are more susceptible to a supply chain attack by virtue of having a wider attack surface.
Ahhhhhh thanks a ton. Now I get it. Meaning I get what you are saying. Not what they were implying. But yeah. I can understand at least how one could arrive at that idea.
To me personally this idea still sounds a bit off - but as a heuristic it might have some merit in certain circumstances.