Looking over the Python spec again, I can maybe see how you might consider it object oriented. In my experience using Python in practice, I am not sure it is commonly used as an object oriented language, though. Not like the other three languages are. I expect this is more like saying Go is a functional language[1] because it has some functional-inspired features.
C# didn't yield the same results. As you suggest, it even changed its name away from containing 'Object Oriented' during the project scope evolution to not confuse people about what it is. I can't find any primitives that would even allow you to write object oriented-style code.
That said, I won't completely dismiss C# as being object oriented as it is the language I have the least familiarity with and very well could have overlooked the obvious. As before, I ask where the orienting comes into play. What language features at least come close the oriented paradigm?
[1] And, indeed, many do call Go a functional programming language. They're not strictly wrong, but it can make communication hard when you're loose like that. In these sorts of discussions you do have to be a little more precise, otherwise you'll end up talking past each other.