The link is about making Linux binaries on MacOS, which works because almost everything to build for Linux is already on OSX. The other way around it's not true. A Linux system does come neither with the OSX SDK nor the Apple patched llvm linker. I believe at least part of the required files cannot be legally distributed with a Linux system, but I might be wrong on that.
Ah. For what it's worth, those have been reverse engineered and copied elsewhere. I maintain a project that does cross-compiled macOS builds and our own signing on Linux.