Oh no of course not. I don't recall saying to actually use it during an OFFICIAL match or anything... I recommend using it all the time .. but in official CAL matches no mods are permitted (including AMX Mod X)
Edit: VEN I'm havin a bit of a problem getting fakemeta to work the exact same as engine... I posted in scripting help if you don't mind looking.
Edit: Well Brad and Suzuka said its not a big deal but if I do learn how to fix the problem I had there using fakemeta and learn what I was doing wrong then I will fully use only fakemeta. Works fine with engine and fakemeta right now though so its all gravy.