I wasted time looking in those links. The WinUI page does not mention base classes (or prototypes), inheritance, or any sort of runtime binding. A "highly-optimized C++ core", in particular, does not imply OO. The std::ranges view_interface template is not OO; it uses concrete inheritance purely as a notational convenience.

Likewise the others, with one exception. The Apple driverkit page does mention base classes.

Factories, adaptors, concepts/traits/interfaces have nothing to do with OO, beyond that OO designs often also use them. OO designs define functions, too, but functions do not imply OO.

It is, in any case, meaningless to trot out apparatus system-vendors oblige programmers to use to access proprietary facilities, and equate that to programmers' interest in whatever tech is used for them. Programmers are interested in using the facilities, and are glad when whatever they are obliged to use works at all; too often it doesn't.