I'unno, last one I remember was about icefrog, iirc. Didn't really fit the description that was just given, either, and turned out the one pinning the name was just kinda' wrong, to boot, if my memory's working right.
That said... at least if all it was was calling them a liar, it definitely wouldn't be inciting harassment. Possibly slander or libel depending on the form (and only possibly, because there's more involved than just something like that), but not more. Inciting takes actually, y'know... inciting. Pretty direct calls or very blatant insinuation. Otherwise folks like Limbaugh would probably have gone to jail a few decades ago and never came out. Also looks like just the name wouldn't necessarily qualify as doxxing either, now that I double check. Stuff covers things that are personally identifiable, and last I recall most names just don't qualify for that. Too many other people with the same name, et al. Tacking on some sort of location or job position or something probably would trip things over the line.
Pretty sure confirming rumors wouldn't even count at all, tbh. The folks spreading the rumors themselves might be properly tagged as doxxing, though, and if the actual information that qualifies is being spread instead of just a sort of "yeah, so-and-so has the right of it" that might stick, too.
Mind, even if it's not actually doxxing or inciting harassment or whathaveyou, that doesn't mean whoever's doing it isn't being a complete dick. Just probably not doing anything that's actually illegal, or publishing information that could get them into legal trouble.