Network booting with PXE, technically, can be a form of remote boot if its still hard wired to the network , so not even off is safe
To be fair, the PXE boot would not affext a powered off device, it would only be an issue if the device was powered on.
But this is just splitting hairs, you have a good point in that few people would expect a PXE boot attack, not to mention that it could interact with wake on lan, which would turn on a powered down computer.