Maybe. But you will never know for sure. Why spend money on something that has no more science behind it than any other superstition?
Perhaps, to a deer, the very things you use to suppress the odour to your own nose is even more "smellable" to the deer than the original odour you are trying to mask. How do those products "reduce" the smell to your nose and brain, anyway? How can it possibly work to prevent you from detecting the smell without creating other scents (floating chemical molecues) at the same time? What is the chemistry and physics of the product, and how does that relate to a deer's olfactory senses? I don't know, and I won't pay money for something that may, or may not, work and for which I can never really tell if it works or not. Why would I?
It's like those deer whistles people buy for their vehicles in the hope they will scare away deer and avoid collisions. Think about the science. First, there is no proof deer are more "afraid" of high pitched whistles than any other particular sound, even though there is evidence they can hear ultrasonic frequencies. Why would they be afraid of them? What logic is there to support that idea? What in their evolution would have made them fear high frequency sound?
Second, there is no proof the whistles even make any sound where people mount them on the vehicles. There are LOTS of places the air flow around a car would not actually go through the device to make any sound. Watch how snow doesn't blow off a vehicle in lots of places, even at high speed. So they mount something they can't hear, in a place they don't know if it gets air flow, and have no way to test it.
Third, the deer already hear vehicles quite clearly. Heck, even I can hear them quite clearly, and I don't hear as well as a deer. They don't get hit because they can't hear them; they get hit because they don't understand what is behind the bright lights, or how fast they can go, or what roads are, or anything else about those two ton steel and glass things. Their brains just don't work like that. Nothing in their evolutionary history has prepared them to understand the dangers of roads and cars.
Fourth, I would bet really good money that if you set up an oscilloscope beside a highway to measure sound frequencies, and drove a car past at 100 km/hr. the car will already be emitting the same high frequency sounds that the whistles are supposed to emit because a vehicle makes "white noise" as it moves. White noise is like white light - it contains all the frequencies including ones too high and too low for us to perceive. Of course we don't perceive them, because they are "ultrasonic" or "subsonic" but they are there just the same. Gullible consumers don't think about the science, and pay good money for something they can't perceive working, because some marketing guru knows people are easily misled about things they can't understand, or see, or hear.
Pay your money if you want. You can go through the rituals of scent reduction if you wish, but I think it's like all other superstitions. I don't bother, but I do hunt with managing my scent plume in mind all the time. I just assume any deer that pays attention will know where I am if he gets down wind.
We could talk about camouflage too sometime if you want.
