The article did not put in quotes that part.
The title included “rigid”, but it was written by the author of the article.
Pope Francis Has Blasted Conservative Christians, Warning That: Rigid Conservative Christians Are Actually Creating A Minefield Of Hatred
That's two "Conservative Christians," one presented as a direct quote when it wasn't a phrase the pope actually used.
What he meant and didn't mean by "rigidity" wasn't spelled out so clearly. I've no doubt that he's some kind of liberal, but what that means in real world terms isn't always well defined.