It may be easier for the R to hear since he is facing the defense. The defense has their backs to the U so he may not hear. This is especially true if you have a big wind coming from behind the defense.
As to the original post, sounds like legitimate defensive signal calling to me. I would not even warn the defense. Maybe if the QB was saying "dodger" instead of "hut" then some action would be warranted but does not sound like taht was the case here.
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