https://jalopnik.com/why-volkswagen-ceo-herbert-diess-was-forced-out-1849328686
This bit from the article:
In his push to transform the company into an electric-vehicle leader, he repeatedly clashed with labor leaders by warning VW was losing out to Tesla and needed to cut thousands of jobs. But failures at the carmaker’s software unit Cariad ultimately eroded Diess’s support from the powerful Porsche and Piech family that calls the shots.
Back in December, VW overhauled its management board, stripping Diess of some responsibilities while tasking him to turn around Cariad. While there’s been a lot of re-arranging since then, Diess didn’t manage to make the issues go away.