There are also operating systems using Linux that have no GNU at all. So it doesn't bother me at all when someone calls it Linux, and I'll continue to call it that myself unless there is additional context needed. Even then, I'd probably just reference specific GNU tools since there are other userspace tools on the system that are also necessary, but are not GNU.

https://www.glaucuslinux.org/

https://www.alpinelinux.org/