I was surprised by the opinion in the quote, as it indicated that a VPN could be used with casino approval, which I found somewhat odd. I know that no means of online anonymity can be used, and all service platforms have the ability to detect such practices, as experience has shown on numerous platforms.
There are still some casinos which allows VPN usage. For instance, jacksclub—they mention this in their terms of service last time I checked. Another one would be betpanda—they have a dedicated page that it's okay.
Just a matter of looking around in each casino's fine prints or asking. But typically, VPN or anything that would mask a user location is prohibited by most platforms. This is also the case with Otherworld.xyz, VPN is not allowed.