[Topolomancer]

Author here---fully agree with you and alluded to that in the footnotes. Of course, a single letter is insufficient to capture human variation. The 'T' is taken to mean researchers that are not only willing to become an expert in a single topic of their choice, but that are capable of collaborating across disciplines, or investing additional resources in the things that are not commonly 'rewarded' in academia but still necessary (foundational work behind the scenes, or the community-building that another comment mentioned).