I think it means Jane Street likely hires with a lot of bias for elites and “twitchy” smart people. The CEO of Alameda was an intern there and invited back for a full time position. Hearing her speak in interviews makes it seem like she has no idea what she’s doing and not all that intelligent or thoughtful. So it’s weird that she, seemingly easily given she states in interviews that she had no trading experience prior to Jane Street, made it through their supposedly rigorous hiring process. It seems their hiring process may not be as rigorous or effective as they hoped, which seems obvious even looking at the process in a vacuum.