It's all scent reduction, neither activated carbon nor ozone can produce total scent elimination. What you're explaining is, in my opinion, why a lot of people don't go all in on scent elimination and just "play the wind". It's a lot of work.
I always try to word my posts as odor
"reduction" and not odor
"elimination". Humans really have no idea how low of an odor level deer or dogs, can detect, so why make assumptions? And we don't know what goes thru the brains of these critters when they do detect very low levels of odor. They are thinking beings that make decisions. They may react to an odor today that they accepted yesterday. We simply don't really know what makes the minds of deer tick.
Throw into the mix all the environmental fluctuations and it gets even harder to predict a deer's response to odor. Humidity, ground moisture and air current play a big role in the strength and persistence of odors. Odors will dissipate much faster on dry breezy days than they will on damp days. Just observe how much better dogs work on damp days as opposed to dry days.
And the "just play the wind" argument is pretty naive. I'm not saying to ignore wind, but wind patterns can get so complex at times that it's almost impossible to predict what it's going to do. And as good as we can sometimes be at reading the wind, sure as crap it'll will let us down when we least need it to.
So I do it all. I pay strict attention to personal hygiene. I also use carbon clothing and I treat clothing, my gear, and my vehicle with ozone.
I'm very careful about not touching foliage and stuff near my stands or along my route to the stand.
I pay close attention to wind predictions and compare those predictions to the actual surface winds thru the use of milkweed floaters. I've learned that even though the meteorologist's prediction of wind direction doesn't always match the actual surface wind where my stand is, those predictions are valuable in understanding how surface winds should behave. For example, in some areas of my woods, a West wind weather system actually creates a very predictable surface wind from the East...180 degrees opposite of the winds aloft.
Whether it's odor reduction, stand selection, weather watching, etc, I love the strategy of trying to fool deer. It's all as much a part of the hunt as anything.
Some guys may consider this stuff too much work but I think of it as all part of the hunt. When I have deer cross my entrance trail and show no signs of alarm or when they get along the edges of my scent cone and wind busts are minimized to the point where they become only slightly aware of a human instead blowing out of there, I realize I can never go back to the days of careless odor practices.