That is a gross, absurd exaggeration.
He has a few classic pop songs, no doubt, and clearly a very lucrative career writing and producing tracks for A-list pop stars. But in the last 10 years I'm not sure he's written any of what I'd call the best pop hits. Looking through his discography on wikipedia I suspect there's some of those songs I know by melody and not by name, but I think he's long past his songwriter peak. And obviously there's dozens off great pop songs that he didn't write (which were smash hits).
edit: I missed all the Katy Perry ones, so I guess maybe he's still got it. But still, I don't see any work with Rihanna, who is probably the biggest pop star of the last decade.