Ohhh shoot... I do use a very strict VPN and I can access. Would you mind sharing which VPN are you using, maybe it's something that I've done wrong.
Just as a double-check I validated in a DNS checker, all the countries are enabled. I do have a heavy anti-bot measures on the page, with a lot of traps, if you ask a bot to crawl the page it will suffer.
Again, sorry for the trouble, and let me know the info so I can validate the VPN and check the access.