This is a hostmaster error, not a user error.
There are two problems. One (the cert/hostname mismatch) is absolutely a hostmaster error. The other (monk pic link is http only) is a site content problem (call it a "webmaster error" if you want to be all 2nd millennium about it). They both need solving (by different people).
Why doesn't Pair have a cert?
They do - see https://perlmonks.pairsite.com/
There's a quick and simple fix for the cert/hostname mismatch and that is to have the DNS maintainer remove 188.8.131.52 from the list of A records for www.perlmonks.org and perlmonks.org. That will put extra strain on the other servers but that's almost certainly a better (temporary) situation than exists at present.
Who manages the DNS?