By that logic, if you know people will judge you from the way you smell, you should never use deodorant.*

* To the extent that there is indeed information contained in the smell as MugaSofer already said, and that making a correct judgment of this information is instrumental and valuable (i.e. "Wrong, I think, to a degree depending on how much them being right mattered.").

If there is important information contained in said smell (for example, hygiene levels) then masking it would indeed be deceptive. If on the other hand some smells are simply disagreeable on their own, not evidence for disagreeable traits (EDIT: remember, adaptation-executors not fitness-maximizers,) then deodorant is not deceptive.