It isn't self-incriminating if you aren't committing a crime. No word is, hence why I can call my ice cream cones "crack" and my ice cream shop the "Crack Shack" and it's totally legal. Like do you really think anyone who hates this site is going to see "woah, they posted someone's full name, DOB, address, pictures of their parents, and shots of the inside of their house from Zillow, but at least they didn't call it doxing." Any court or police agency who agrees with them (i.e. people who don't obey the law, because there is nothing illegal about the sort of doxing Kiwi Farms does) isn't going to care what it's called. Normies don't care what it's called because normies don't like it. Rehabilitating the reputation of this site in the eyes of crooked judges or the general public at the expense of making everyone here play silly language games is just silly.
What is considered impermissible doxing is often a matter of intent - or reckless disregard. The laws often involve reasonable person standards when it comes to proving those things.
So if you have info published, some kind of harm to the subject (which may be purely emotional harm, btw, or whatever is harassment in a jurisdiction, or a variety of things), and the big question as to whether it adds up to doxxing as that law defines it is intent or (in the site owner's case) in some places, reckless disregard for whether harm could occur as a result of the (re-)publication of info.
Then you have a bunch of idiots running around high-fiving about "doxing" that person, what do you think a jury or jury is going to think? How much do you think they're going to say, ohhh, but see, despite all the articles and accusers characterizing KF as an evil mob bent on harm, we are going to believe Matthew and Josh when they swear that the kiwi farms absolutely and exclusively uses the older, purer term, and when they say doxxing they always have zero intent for anything bad to happen, so on this borderline case, we'll assume that's what they meant, and therefore no intent /reckless disregard? And if it were your business and your money at stake, how comfortable would you be that yep, sure don't need to try to avoid adding additional confusion or fuel to the fire?
I'm going to go out on a limb and say that if posters posting info were not anon and potentially risked loss of position, business, income, etc., they might appreciate taking some similar steps.