The defining feature of mainstream OOP (as popularised by languages like C++ and Kava) is the entanglement of type hierarchy and API contract. In other words, inheritance. And inheritance is the main point of criticism of the mainstream OOP. You can call it class-based programming if you feel this is more accurate. Let's not get stuck at terminological issues.

At any rate, I apologise for using such an ill-defined term as "OOP" in the first place. This terminology is so overladed and washed out at this point that it might sense to retire it altogether.