This is the prologue to a video game. Below are the official subtitles in the NTSC-U release.
"However, there are only a few scholars in the world who believe this."
Clair: "You must be one of those scholars then, professor."
Koji: "Actually, this idea is not even accepted as theory."
Running the last sentence through google translate without 少数派どころか、gives:
学説扱いされていない。- It is not treated as theory.