He doesn't even mention C++ in his essay [1], but regardless, the C++ OOP is pretty much the mainstream OOP, which we still use today in Java, Kotlin, C#, etc...

And... no, the change in mindset about OOP never happened. Kay and Armstrong's view of OOP never took on. Today, OOP is still not seen as message passing and mostly seen as polymorphism, parametric typing, classes/traits/interfaces, and encapsulation. The complete opposite of what Erlang is.

[1] http://harmful.cat-v.org/software/OO_programming/why_oo_suck...