This mod changes the skins which are passing by when you're opening a safe and it's NOT modifying the actual skins you're getting.
Display real safe odds: Skins which are passing by represent your actual odds to get that item. (Biased by around 1,5% due to legendarys crashing the game when passing by.)
Fake safe odds (Blue, Purple, Pink, Red): Skins which are passing by are the color which is in the mods name.