Linus wrote a kernel, and GNU wrote the majority of the userspace at the time.
How is that coat-tails-ing? Both projects had a tremendous amount of effort poured into them. And let’s not forget GCC was the only free compiler for 20 years.
If people were asking for it to be called “GNU” only, then it’d be unfair. But they aren’t.
Doubled down on being what?
Are you trying to argue that anything written here is false? Can you prove it?