Much ado about nothing.
Amy Amy Coney Barrett used the term "orthodox Catholic" in a a law journal article she wrote in 1998:
Catholic Judges in Capital Cases 
http://scholarship.law.nd.edu/law_faculty_scholarship/527/

It's perfectly legitimate for someone to question her about her views and her writings.
https://www.nytimes.com/2017/09/13/opinion/faith-law-and-dianne-feinstein.html