tl;dr. "too cheap to meter" is just a well-known turn of phrase to point to the fact that nuclear is inherently affordable over time if you control for certain factors.

i acknowledged in my comment that "too cheap to meter" isn't a realistic expectation for a modern plant, and made the point that nuclear can be _more affordable than it is now_. for further technical reading you can start with https://world-nuclear.org/our-association/publications/onlin...