The video is not continuous, so it is not clear whether it starts the take-off run from the beginning of the runway or from the place I have marked.
If KE started his take-off run from the point I marked, it means that KE made the run in under 300 meters. If it started run from other runway start point, it's around 550 meters.
For reference, in the third test flight, KE took off from a distance of about 510 meters. So there is a high probability that it will probably take off around 500 meters again. They may have edited the video in a slightly misleading way.