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.
Academically, you’re right. For practical reasons, you probably don’t care how Simula, E, Lisp and Smalltalk (languages mentioned in that 20 year old article) implement it. This seemed more like a beginner question so I think the Java definition is a good starting point.
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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
Academically, you’re right. For practical reasons, you probably don’t care how Simula, E, Lisp and Smalltalk (languages mentioned in that 20 year old article) implement it. This seemed more like a beginner question so I think the Java definition is a good starting point.