There is the option while reviewing to filter by a tag. Currently r and rstats which are tag synonyms don't give the same results. I don't see anything when filtering by 'rstats' but get results for 'r'. It seems that both should return the same results.
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I would have thought this was expected behaviour? As tags are automatically renamed if they are synonyms when the question is posted the rstats doesn't exist in the database on any questions so it seems correct that there is nothing to show.
If the synonym must be replaced in all the questions, then:
(Moderators do that in the same page, which is the one that allows them to make a tag synonym of another one.)