I've had the same problem for a few days (Quest 2 with DeoVR). I tried with and without VPN, and also tried tethering to my mobile phone's 4G netork to try and rule out anything to do with my ISP. Other websites work OK, and speed tests seem normal.
Actually, I managed to finally get onto the website last night after multiple refreshes, but it didn't last very long, and would nearly always fail to connect (eventually returning "server failed to respond" messages, or similar) when I tried to navigate around the Live Cam section of the website. When I entered a chat room the stream worked fine, it's just getting onto and navigating the website that wasn't working right. This would have been around 11pm CEST.