All electrical safety plug-ins are powering off and then applying the delay. This is to ensure a minimum time with power turned off before turning it on again, in addition to let the DUT stabilize after powering off.
This is also consistent with the way the Power On Delay is implemented. The DUT power is switched on and then the delay is applied, allowing the DUT to stabilize after powering it on.
If you want to perform any actions before powering on or off a DUT, you should use the "Stop Before New Power Configuration" and/or "Stop After New Power Configuration" options.