The error is cert authority invalid. Either someone actually hacked the site and provided invalid TSL certificates (which I'd rather doubt) or simply the certificates root certificate was revoked or expired. That happens quite often actually.
I would wait until the issue is resolved though as we can't tell. Especially after all the Log4Shell issues lately the chance of corruption is higher than usual.
Generally spoken: In the current state you can't trust the page no matter what the root cause is. If it's just an invalid cert they should fix it within hours usually.