For example, this post contains an address:
https://kiwifarms.net/threads/onision-james-gregory-jackson-...
Here is a post containing the IP of some user:
https://kiwifarms.net/threads/leonard-f-shaner-jr.9940/page-...
Here is a list of past addresses for someone:
https://kiwifarms.net/threads/russell-greer-just_some_dude_n...
Past addresses isn't doxing.
You have one example. I do appreciate the example. I don't really think 1 post is really systematic though. You could easily find an address on any of the big players. They appear to remove posts that get reported so it is possible this one wasn't reported.