It's being a resident of those restricted countries that is not allowed, as in accessing the sites while you're being in their soil, not for having those countries as your nationality. For example, a UK-born person are allowed to access the platform while he's taking vacation in Singapore [I... guess], or being an expatriat in Romania. So, unless OP left out some story here [like he actually accessed from UK, or something], that clause in their TnC is indeed not breached.
I'm not sure how accurate this would be. If you are a resident of the UK (or any other banned country) and you just go on a vacation for a few days I'm not entirely sure you'd be in the right if you are depositing, playing and withdrawing from the site. As you are tax liable and so on in the country you are a resident of.
If this guy however
lives in Norway and has a VISA or whatever else would be needed - it'll likely be different.