Nope, more of a coma. And he wasn't a ghost, he was him, soul and all walking around. Bob even said so in their talk to save Forthill.
We have a dualistic worldview here, there is a material and an immaterial part of you. Your body can be in coma but if your soul and spirit are gone you are dead.
Your body can be in prime health but without the immaterial parts, spirit and soul, it is just dead matter. Mab and demonreach and the parasite were just keeping the body alive but Harry was dead.
Then were was his soul? together with his spirit wandering around on a task for Uriel (ultimately for himself but that is Uriel as we know him)
He was in afterlife. Just not beyond reach.
A ghost is simply a part of your spirit you leave behind when you go on. A shade is you when you refuse to go on and somehow nobody claims you like what happened with Karen. Spirit and soul together. Still free will but dead.
You could say that Harry was a ghost with a soul. It is just not how we usually look at it but it is as logical as a body with or without a soul.
There is a few lines from a beowulf translation I remember:
He saw in the hall, all huddled together.
The heroes asleep, then laugh in his heart.
The hideous foe, he hoped ere dawn.
To sunder body and soul of each.
That is the worldview. In that worldview when someone is on coma and life support the important question is:
Is his soul still there? If so you keep the life support running, if not you can pull the plug.