Oh great, I missed that end of the page. The "Round 2 details" links back to the blog and it is hard to see the FAQ on mobile (needs manual scrolling to the end).

Google search and Perplexity failed when I tried, too. Google search has caught up now (haven't retried Perplexity)

A 41.5mm diameter sounds good. That's a whopping 10mm/20% smaller than my current watch. Should be really neat given the thickness.