After some research into this shot, it seems as though it was created by retired Egyptian squash pro, Hisham Ashour, the older brother of squash legend Ramy Ashour.
This video features Alex from Control the ’T’ Sports demonstrating the shot into each front corner from a figure of 8 routine drill. The Mizuki basically involves twisting your racquet round just before striking the ball to essentially play a forehand shot from a backhand swing.