Pimoroni Button shim - Power On/Off?

Can the Button shim be used to power on the Raspberry PI? Or do you have to use the on/off shim?

You would have to use on/off SHIM, the Pi has no way of knowing a button is pressed on Button SHIM unless it’s already powered on. You could use it to power off the Pi, but you’d have to unplug/replug the Pi to power it back on.

That was kind of what I thought… It wouldn’t be powered when off.