The gate will not reduce noise. The Input block (first thing on the signal grid) has a “noise reduction” feature. If you double-tap / click that block you can tweak the noise reduction.
The gate itself will not reduce noise; just clamp it down more efficiently depending on what signal you side-chain it to.
Neural Support told me by mail that the gates on the inputs are the same algorithms as the “simple gate”, so there isnt any noise reduction on the input gates.