So the simple reason this is called power through light is because the line from breaker first enters the light box. All regular switches 2+way pass a line in and load back to the light, but the wiring to accomplish this differs based on the origin of the line and exit path of load.
Smart switches on the other hand also need access to neutral, so when line (and neutral) enters the light box, you can’t normally use them. In the diagram above you have 3 wires to the switches, since you also need neutral you would need to have a way to pass 4 wires (neutral, line, traveler and load) with standard GE switches.
Here is a thread about GE 3-way switches and what can and can’t be wired with existing wires.