Kroiss led pretraining projects, while Nordeen (who previously helped Musk with big layoffs at Twitter) handled operations.
Their departures coincided with SpaceX bringing xAI and X (formerly Twitter) under the same corporate umbrella; no explicit plan to merge the businesses has been stated.
This all comes as SpaceX is rumored to be eyeing a public offering, signaling even bigger shifts ahead for Musk's companies.