In addition to what FlareArmed2 said, in China you can't get a wave off from the ground crew before you start to taxi, because they simply won't wave back before you have your taxi light on and start moving.
Hence, this procedure works only this way.
With my seventh operator here, and none of them had a procedure to get the wave before doing the checklist.
Also, as already said, in the Airbus world it is perfectly acceptable to do that checklist while taxiing.