Couldn't it be a simple test of whether the applicant had read the posting thoroughly? It's a quick filter to remove anyone who didn't manage to fulfill this no-effort criteria in their application.

A lot of applicants simply send their resumes to any position that is vaguely relevant, without diving into the details of the role.

A little bit like Van Halen's "Brown M&M clause": https://effectiviology.com/brown-mms/