Yes, I'm using the GMS2 Mac beta. I don't think the debugger is implemented, or if it is it definitely doesn't run. I don't see any errors, it just looks like normal output (what I linked above). It seems like the library calls may just be returning 0 (erroring or not finding the functions). I created a simple dylib on Mac and it wasn't working at first. Then I recompiled using the first two lines of your script here and the calls started working.
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I have the sample project that I'm using for GMS2. here are the system log and the game maker console. though I can't seem to get GMS to run in Debug Mode. not sure if that's helpful. anything else I can try? I really want to get this working I think it will speed up my prototyping speed tremendously