Autorotation relies on one main thing, air being forced past a freewheeling rotor… Air that is being forced past because you’re falling.

https://youtu.be/NLjFQJiJsZc?feature=shared

Notice the immediate loss of attitude? It’s because they’re falling, unlike planes which can generally glide after an engine failure.

https://youtu.be/CEMlny_ExuU?

Specifically we’re speaking about helicopter ejection which in most cases means total loss of power or control or both. The only known helicopter eje tion seat(to me at least) to operate currently in modern combat is the ka 50/52.

https://youtu.be/W6y_id3xOX0?

One like this one which happens to eject and notably falls like a stone.