I hate to appeal to authority, but I have been working with large cathedral-style open source projects (mostly three: GCC, QEMU, Linux itself) for about 20 years at this time and have been a maintainer for a Linux subsystem for 12. So I do know what I am posting and talking about.
The very fact that I had never learned about this subsystem from LWN, Linux Plumbers Conference, Linux Security Summit etc. means that the problem is not technical and is not with the maintainers not replying it.
A previous submission (7000 lines) did have some replies from the maintainers. Apparently instead of simplifying the submission it ballooned into something 150% larger. At some point I am not sure what the maintainers could do except ignoring it.