LinuxCNC may be one of the applications why they couldn't say all, as opposed to much. Give it a shot on BSD to find out though.
Binary compatibility usually means the executable file format, like elf
en.wikipedia.org/wiki/Executable_and_Linkable_Format
So what your statement likely means is BSD can run the executable file from Linux directly, no compiling needed. Most BSDs use elf anyways. Getting the code to build locally is likely your best chance at success I'd imagine. But even if you get it to build it still might not run. make -k baby yeah! keep going!