LoC by itself is useless and so is AI LoC, it doesn't really show anything by itself.

But if you pair AI LoC in a range and also task completed in the same range and then compare that with historical data over a similar range without AI, then you have something tangible.

You also need to look at defect reports to understand the full picture of is AI being helpful.

So, we do need to measure AI LoC and AI PR counts, but we also need to make sure we are using other metrics to help paint the full picture.