No, that's not what "Reported-By" means. The kernel community has different conventions.

This entire HN comment section is ridiculous with everyone acting as if the author wrote an entire subsystem and someone else took attribution.

The author here figured out a bug and suggested a fix. It happens that they conmunicated their fix in the form of a patch, but that happens very regularly in kernel land.

In the end the author got a Reported-By, which is entirely appropriate for what happened. If the maintainer accepted the author's patch as-is or with minimal modification then yes, they should get Author attribution. But the patch that was taken was substantially different.