1000 km is not that long range. US, Russia and even Israel has cruise missiles with ranges upto 3000 km. I don't know about China but its possible they also have. Now achieving 1000km range at 0.8 mach speed is not difficult as you don't really need a special material to build airframe which you need in case of high speed missiles. For high speed missiles you also need powerful engine while we have a lot of engines available to power a subsonic missiles.
So yeah it will still be an achievement as its build by us and not in partnership and the fact that still not many countries have the capability to make a cruise missile but its not much as compared to Brahmos and especially A5 and SLBMs.