Not the product. This page exists so #47 and #267 have something that returns 200 over HTTPS, so "CNAME-live to HTTPS-working" is an observable moment rather than an inference.
The vercel.json beside this file is copied verbatim from apps/renderer/vercel.json. If the response carries Content-Security-Policy: frame-ancestors 'none', that is the first observation that Vercel's edge actually emits the header #100 shipped.