> a 'true' OOP language, like Smalltalk.

I guess Simula, which is older than Smalltalk, doesn't get a say.

What would it have to say about it? When "object-oriented" was first told, it was said that what defines it is message passing. Simula does not have message passing. It uses function calling. Simula does have objects, but having objects does not imply orientation.