Not only does it not spook deer, I think it attracts them out of curiosity.
One of the funniest times I ever had in the woods was when Big Country and I were on our lease in Illinois in archery season. we were on stand out of sight of one another but in earshot. I'm on stand and I hear this gawdawful disgusting sound that kinda reminded me of a buck grunt. Pretty soon 5 does come by and one is acting funny. Hard to describe how she was acting at first, just strange. Then all of a sudden her head starts tossing up and down and her sides start heaving then she starts puking right in front of me! Turns out she walked right under Big Country and he had spit out a big wad of beech nut which she found, sniffed for a minute and promptly swallowed! The sound I heard was her immediately yakking it back up. She heaved every few minutes till she was out of earshot. Left me wondering WTF? till we got in that night and big country told us how it all started.