I managed to access the jellyfish.land page after adding an exception to my firewall/security software. Using a VPN or even switching networks completely (e.g., using 5G instead of WiFi) will only work if the traffic is being blocked at the local network or ISP level. If a user has a security endpoint enabled on their device (which many will, as these often come bundled with their OS, browser, etc.) a VPN won’t be effective.