Can Siri Be Used to Trigger a KM Macro?

Standby? No, I mean the shortcut is always running. It's always listening to me. That's what makes it different and cool.

Correct! It is not triggered by Hey Siri or a keyboard shortcut. It is always listening.

There is no one else in my house, but if there was, it would hear them too, and that would be a problem. I guess if I was watching Apple TV, I would have to disable my macro. However if my Mac was feeding a video into AirPods, I guess I could have my macro running even if a video was playing.