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.
Viewing post in GMS: 2 Mac Demo not working
I'm using pretty much the same script for this, plus the slightly tweaked makefiles for Lua (included) because of GMS requiring dylibs to be 32-bit. Could be that old thing with dylib->dylib references - I should probably try compiling Lua+Apollo into a single dylib again later.