‘While doxers sometimes use hacking or deception to uncover personal details about their targets, contrary to popular belief “most of the info is public,” according to one researcher who has spent years studying and participating in the practice of doxing.’ — https://www.dailydot.com/debug/dox-doxing-protection-how-to/
The vast majority of doxxing does not require unauthorized access, social engineering or betrayal by an affiliated person. Instead, it’s almost always connecting dots between openly available bits of information and then packaging that information so as to direct and simplify harassment.
You can make the case that this data should be private, and I might agree, but that doesn't change the fact that it is currently public, hence there is nothing to be "revealed" or "doxxed". The information is already out there, in public, easy to find.
Regardless of your definition of public, the word doxxing has never covered it. We have plenty of other language to refer to the sharing of publicly available information. The word doxxing was coined to give a name to a type of invasion of privacy that came to prominence with the rise of the Internet. If you want doxxing to just mean gossip, then your word no longer has a useful and distinct meaning.