Nope. I'm not getting duplicates.
after reading your comment saying it doesnt, i spent the last 40 minutes trying to replicate that, and at some point i thought im just losing my mind because i couldn't. but i think i finally figured out why it DOES and DOESN'T.
if you import a review and translate it / change the text (or the name, not sure which one yet), it will re-import the original review as like it doesnt exist in the system.
spending the last 40 minutes trying to import/update reviews in any way possible, i figured the only 'duplicated' reviews i get are the translated ones, so testing this idea i imported a review to a product and changed the comment text to: "changed text for testing purposes. A.K.A “Translations of reviews”
and the name to "Valeri" because the original name was V***i, so i kept it's base.
published the comment and then updated comments in both ways: through aliwoo settings (the bulk update option) and the direct product update from the WP product edit panel. both methods gave the following results:
it did reimport the original comment, so the same comment now exist in the system twice, just different text/name:
you can see the name, the date published, and the pictures are totally the same.
but bottom line, i guess it doesn't "duplicate" the reviews, since you basicly changed the first one so its not a "duplicate" per se.
but it still 'looks bad' having the same comment with the same pictures over and over again but different text - if you miss the duplicates.
next thing ill test if its duplicates just by changing the name, or the whole text needs to be changed.
hope im clear, because i got a little confused my self.