There are about 4-5 different ways to enable the cheat, and on definitely works.. but I cannot say that after the november patch. I've been using 1, myself. I will check if on is still working for me.
You're lucky. Metro can't get them to work on his mac at all.
I'll have a look at this issue here in a bit, and maybe i'll make sure people realize there are other options for enabling the cheat, just in case someone else finds themselves unable to use the simple on method.
Edit: On is still working for me. I noted on the guide that yes, 1, and true also work to enable the cheats. 0, false, and no work to disable them. I've asked Metro to try all the various methods to see if he can get them working on his Mac. Any other Mac users playing through boot camp unable to get testingcheats to work?