It's called "We just discovered Claude Code and so we think Anthropic is Amazing so everything they do is godlike and thus their design choices must also be god like. Apple is Dead, Long Live Anthropic" style.
Hm, I don't think this looks like Anthropic's design style. Anthropic is kind of doing a Chobanicore + Corporate Memphis design system that I personally find kind of creepy. But the website here just feels fresh and pleasant.