It seems like teletext is unusable in MacOS X interface. You're not able to see other than the default (100) teletext page.
Here's the feature request in trac that someone opened but nobody replied to it:
https://trac.videolan.org/vlc/ticket/4908
I guess when decoding and displaying of the default teletext page already works then displaying any other page should be just as easy. And it should be just a matter of adding a few UI buttons, menu items and calling the specific function with a different number than 100. I'm wondering where the problem is.