It was that whole Japanese "subclass" of meat workers, who lost fingers due to their profession, that was looked down upon. So four fingers was considered a rather insulting.
It may have had some reference to the Yakuza as well.
Presumably they changed it for everyone in Exoddus because they didn't have time to render both cutscenes.
EDIT: Alcar beat me to it rather succinctly.
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