That's going to be their Linux driver stack, I presume (given Samsung makes Android phones, and Android uses the Linux kernel).
It's an open question how much code their MacOS driver shares with their Linux stack, but I wouldn't assume it's much at all. The Linux driver is split into kernel and userspace portions. The kernel portion is probably very specific to the Linux kernel, while the userspace portion will tend to be specific to the APIs it supports: OpenGL and Vulkan on Linux, Metal on MacOS. Then again, I don't even know how much of the userspace portion AMD would maintain, on MacOS. It could be all Apple's, for all I know.
Regardless, it's likely not a big deal... just something I thought was interesting.