I personally think it is just a fancy name that they use locally for a redder morph of cherry shrimp. Sort of like how we grade crystal red shrimp here according to their colour.
From the pictures I have seen, Sakura shrimps get redder and the entire shrimp is red (including the legs). The subject in the above pictures are less than 2hours in the tank.
p.s. For those interested, the camera settings is in the EXIF data. The camera is a Canon 40D.