Yes. Because Anthropic made the site as an ad. It even says in the footer “made by Anthropic” and some vague copyright notice about the words for Rubin.
Ads don’t need to have a call to action. Coca Cola ads don’t tell you to go buy a coke.
I also wouldn’t call it “celebrity/partner marketing” when they built the site and (likely) paid him for the words to go with it.