The person in question is Paul Christiano, whose substack reads like a bland parody of rationalist blogs and whose career trajectory according to the wiki indeed indicates a deep connection to the EA military-industrial complex, including familial ties as his wife works for Open Philanthropy.

His main claim to fame appears to be his involvement in the development of RLFH, otherwise he sounds like a standard-fare EA-funded alignment think-abouter, and also SBF liked his start up to the tune of $1.25M.