Regarding IP addresses as PII... Practically speaking, if you can put an IP with a second form of ID like a first and last name, it's PII. However, it isn't officially mentioned as a form of PII, but the tech world and the internet is one of the least regulated entities out there, so I'm guessing nobody has thought to formally include that in the PII guidelines. As for me, if you know my IP (and I know some of you can find out), and you've been paying attention to my posts, you can likely ID me with a quick google search.
Thork brings up a really good (and scary) point that you don't know what the laws will be in 30 years... You used to be able to get away with saying some shit or doing some shit you later regretted or was unconventional, but now, if you put it out there it stays.