I think this doesn't apply to new SP awarded since starting the powerdown, as the powerdown calculation is based on the total at the time. So if you are powering down, throw on a few thousand SP, this extra can be delegated. Also, I'm not certain, but I think you can set how much of your SP you are powering down, I could be wrong about that.

Yes, I worded it wrongly. Hopefully it's clearer now.