the comments in this thread show that there are different answers to the question, including different from this post.

Nonetheless, I appreciate the link. It’s a good read.

It’s simply not true that there “aren’t really that many definitions of OOP”, much less that the guide you’ve linked is “comprehensive” when it is specifically about Java.

This is a good, brief post about the different conflicting definitions: https://paulgraham.com/reesoo.html

This is a much more comprehensive but also less focused overview, with many links, from a site that is effectively both a wiki and a forum: https://wiki.c2.com/?ReesOnObjectOrientedFeatures