You mean: they’re not properly alive.
Well, you can always try to kill them, and you might accomplish doing so, but so what? What’s this in aid of? 
Yes, they are just dead in our world. Exactly.
Well, we’re dead to their world whilst awake, aren’t we? 
It all depends on whether you think of them as an actual person, or a spirit, or a person made up from your mind, or anything else.
Hey- I’m not dead, right? 
I have two main guides. A young girl who washes my hair & reassures me, another who shows me collectives. I dont know what all this talk of Killing them is all about though.
Sometimes I make them chase me through differend scenes and obsticles, one of them only just touched me once but I got away straight away.
Its a wonderfull playground and its a gift to us all 
It’s the first time I hear this opinion about SG’s. 
Where did you find it?
I think he maybe suggesting what I believe, that spirit guides are real and were people who have died in the physical world.
Why do they have to be people who died, or need to be defined as alive or dead? They could be hallucinations. (Note: the human mind can invent things. You can see things that aren’t there.) Moreover, I state that this resembles the placebo effect. You are told they exist, so your mind tricks itself into believing it, even to the point of creating your own SGs which are just elements of your own conscience.
On your dream citizen registration form:
DC reg form:
Please check the correct answer:
Name: ______________
Job: Spirit Guide_
___Dead
___Alive
_X_Imaginary
___Male
___Female
___Another IRL person (SD)
It’s a curious yet interesting point of view. I think I’ll create a special thread about it. 
[Edit: thread created. You’ll find it here. ]