IMHO, both "factions" are saying right things.
Assuming bleu and RMS calculator are wondering on the latest release of eathena, it seems on "deafult" settings Luck dont decrease chance of getting frozen.
But, as Aragorn and Kurogasa shown, Luck its mentioned in the formula. Old. But workable.
From my personal expierence, Luck help against status change. Obliouvsly, experience on HRS, b/j lvl255/xxx, stat cap 255~300, if you get 300 Luck you can easily wear any kind of armor, you will never freeze.
As you can notice, put 300 stat points into luck it will decrease a lot all others stats points, you need to combine MDEF and luck for gain immunity. So, on a normal server (99/70) it will be worthless to put 99 luck for a "mere" 30%~, what kind of build you will use then?

Maybe is for that reason who play mostly on low server dont even think Luck can help with status, becouse the % its small so its hard to notice.