The article is right: it is almost never a compiler bug. I have had that experience of reporting and being wrong. It sucks.

On the other hand, I have a confirmed bug in Clang [1] and a non-rejected bug in GCC [2], so it does happen.

[1]: https://github.com/llvm/llvm-project/issues/61133

[2]: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108448