What is he selling? How is this time different compared to when he was at OpenAI or at Tesla? You could say he was shilling those products too. I don't see any shift. He's still posted free in depth YouTube videos recently.
FYI, Karpathy has 2.5M followers on twitter, Anthropic has 1.3M (OpenAI has 4.8M, for comparison). I'm sure Karpathy will be doing mostly research and will make real contributions, but I also think it would be naive to ignore the weight of his voice. It's not negligible, nor is it the only thing he brings.
Is that a serious question? He already promoted vibe coding and AI hype. Now he is literally there to promote Anthropic and its IPO price.
When he was at OpenAI it wasn't overtly commercial yet. At Tesla he had a way lower profile. Now he is the vibe coding Jesus for deluded software engineers. The impact is much larger.
He was literally rolled out in front of camera as Tesla's AI prodigy at multiple streamed events designed to appeal to techy consumers and dev recruitment. He's definitely been one of AI's public personas for a long time now, and his employers have regularly aided/directed/utilized him accordingly.