Fred Lambert was an early Tesla evangelist - he constantly wrote stories praising Tesla and Elon for years. He had some interactions with Elon on Twitter, got invited to Tesla events, referred enough people to earn free Tesla cars, etc.
People roasted him for being a Tesla/Elon fanboy: https://www.thedrive.com/tech/21838/the-truth-behind-electre...
Fred gradually started asking tougher questions when Tesla's schedule slipped on projects and Elon ended up feuding with Fred (and I think blocking him) on Twitter: https://www.reddit.com/r/teslamotors/comments/bgmwk8/twitter...
Since then Fred has had a more realistic (IMHO) outlook on Tesla, although some might call it a "beef" since he's no longer an Elon sycophant.