But if Rockingham approached LFS (rather than the other way around) then the fact that there is a 'similar' track already in LFS (which is very, very, very different anyway) will have little to do with it.
Imagine Scavier were asked to include Rockingham in LFS for various reasons, and were allowed to use the track in the public release.
The nature of the agreement (let's say laser scanning and telemetry data to refine the model) might mean that some things need to be improved - bouncy barriers (although it's very unlikely that Jordan 'Moron' 2007 was able or allowed to check every barrier of every config for the bug, which mostly afflicts the AutoX red/white barrier anyway), tyre model over bumps or camber, meaning that this has to be 'fixed' prior to release, or even announcement.
It may also be that Scavier were asked not to make this public knowledge PRIOR to a particular event (perhaps the BTCC race at the weekend), hence no mention of it so far.
But essentially the fact that Kyoto exists in no way diminishes the chances of this being fact.