FRANKFURT—Tesla boss Elon Musk has addressed 200 Volkswagen executives via a video call after an invitation from the German carmaker’s CEO Herbert Diess, who wants to galvanise VW’s top brass for a faster pivot to electric vehicles. The comments on Thursday by Musk to a VW managers gathering in Alpbach, Austria, confirmed by Diess via Twitter on Saturday after a report in Handelsblatt daily, included praise of VW for being an “icon” and Tesla’s greatest challenger, Handelsblatt said. The paper said that when asked by Diess why Tesla was more nimble than its rivals, Musk said it came down to his management style and that he is an engineer, first of all, and has an eye for supply chains, logistics, and production. In a post on Linkedin, Diess added that he had brought in Musk as a “surprise guest” to drive home the point that VW needs faster decisions and …