How to interpret the explicit references to GNU in the LSB specifications?

The LSB is a specification, and as such, should be provider neutral. But it contains many “hard‑coded” reference to GNU at many places. Ex. the ELF Linux's specific entries PT_GNU_STACK, PT_GNU_RELRO and al., or with some libraries like libgcc_s. How these explicit references to GNU in the LSB should be interpreted? * Is it there for historical reasons (like the MZ magic in one of the Windows executable formats)? * Is it there to designate GNU as a unique provider for some parts of conforming systems? * Is it there as an acknowledgement of some role played (currently or in the paste) without any particular mandate? I would not have asked this questions, if the references did not appeared in a standard specification, I mean, the questions should be understood in this particular context.