LOC can be one measure, but not always the sole or best ones.

Since LLMs are word generators, and have a propensity to generating words, they need to be shaped to understand simplest is best, more isn't more, and less isn't more always.

Trimming down and cleaning up could be formatting, standardization, commenting, or even some basic re-architecting that was overdue.

One of the biggest benefits of llms for refactoring I'm finding is reducing technical debt.