I don’t have the built-in VPN turned on, my internet connection is fine, I use NordVPN but I’ve tried disabling it to access the site, I’ve disabled my firewall, I tried the same site on chrome, I’ve reset my browser cookies and still, nothing is working to get this site accessible. Any ideas?
FIXED:
I force closed NordVPN and re-opened it. I then disabled the “Web Protection” service in the NordVPN app and the Opera domain sites started working again. I whitelisted the Opera domains and they still work.
This sounds like an unintended side effect on NordVPN’s part.
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Just checked and the page loaded fine here. How are you trying to access it? Using the menu? Typing the address?
https://addons.opera.com/en/extensions/ specifically loads for me for what it’s worth.
Didn’t work for me. Same error 
What exactly error message is given?
I know you tried with and without a VPN, but what country are you in?
Does it happen in any other browser?
In a test standalone installation of Opera GX?