I don’t think it is the Japanese laserdisc. As seen in the TV capture in the same review, the colors are quite different from the LD. I have seen this review and from what I remember they did mention the LD, but they did not say that it was the video source used for the Blu-Ray.
In the video they say it is, but they could also be wrong. As for color, whatever company that made it could have made adjustments.