Do high-ranking US grad schools typically interview PhD applicants?
I have not seen anything to indicate that PhD programs no longer interview candidates. I was interviewed in person by many (~75%) of the schools I got into for my PhD program in 2015. I doubt this has changed in 4 years. In fact, I helped interview several candidates in 2017 and 2018 at my school. I was invited to tour and interview at several well regarded schools in my field. 

Note that some schools do not interview candidates. This is especially true of lower -tier schools in my anecdotal experience. But I had colleagues who interviewed at some rather prestigious schools in Massachusetts.