I do not use Mullvad, however, I have had the same issue with sites, not rt(.com) in particular, but others. All I do is switch locales and usually the problem clears up. I haven't figured out exactly why. A lot of VPN IPs have a tendency to be abused and so a certain website may have blacklisted your IP number of the VPN locale you were/are using. Could be some scenario such as this.
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