Maybe, it is fault at Nord VPN's end? Were you banned by this forum for using VPN? Can you elaborate yourself? Maybe your IP was blacklisted, so maybe because of that you're unable to access bitcointalk. Read this: A:
Your IP might be banned because it was used by a user that got perma banned. Don't worry - IP bans decay over time if there's not too many of them during a small period. If you register using a banned IP, are using TOR, VPNs or well known proxies, you will have to pay a small fee. This is to prevent spammers while allowing legitimate members to post without many restrictions.
Wrong board by the way. Move it to meta(see move button at the bottom left of the screen). This is NOT a Scam Accusation. Good way to prove that you have been a member of this forum for years.