SSL stuck — "thesupersibs.org doesn't appear to be served by Netlify" despite correct external DNS

Site name: thunderous-tulumba-c086d3

Custom domain: thesupersibs.org

DNS: External (Hover) — A records 75.2.60.5 and 99.83.190.102, CNAME www → thunderous-tulumba-c086d3.netlify.app

Issue: SSL cert won’t provision. Dashboard shows “doesn’t appear to be served by Netlify” but curl -s -I http://thesupersibs.org | grep -i server returns server: Netlify. DNS is correct, Google DNS cache flushed. Renew certificate button does nothing. Requesting manual backend cache flush.