The Software Mansion folks designed it and we actually iterated on the designs on Figma, having discussions as humans, and exploring alternatives. They were lovely to work with.
I also worked on all of the copy myself, collecting feedback from core maintainers as I went. The new tagline was a suggestion from Theo which we iterated on. I did use LLMs as an assistant, but I did not ask it to generate the content.
Might as well use LLMs for the whole thing next time, since we will be accused of doing so anyway! :D