They oversee R&D programs. They might not be good scientists, but they do a very good job running an R&D intensive organization. Unless your definition of science is "writes papers nobody reads about stuff no-one cares about while being payed tax dollars", industrial R&D can also be science. Of course, Facebook is a terrible example. Google would be a much better one. Intel or Boeing would be even better.

There'll be people who say that computer R&D isn't science, because it's just gimped math or hand-wavy pretend engineering, but they'd be the same people who say that most of the stuff computer science academics do is also crap.