That's also the kind of Website, beside the impressive technical result, that reminds me nothing can be blocked.
It's not about bypassing VPN or deep pack inspection, rather it's about how once anything, including a very complex video game (like here) to an entire OS with a host machine (like QEMU on WASM, or a random InternetArchive link about emulation) is "just" a Web page that can be hosted... on anything (including a 10 bucks Rasperry Pi Zero which can also be an AP, a phone obviously, heck even a e-cig!) then it doesn't matter what is "blocked" as it can be brought to anyone with no installation.
Sounds like companies should start locking down browsers to disable WebGL, WASM and other similar APIs targeted at apps as opposed to web pages. I would welcome this if it got web developers to stop using more than they actually need.
I made the old MMO EverQuest but in a browser, complete with a custom server built from the ground up. It's in a bit of a state of transition right now and sorta buggy, but:
https://www.idlequest.net/
It shares the neat feature of the HL2 project in that it doesn't need any installation, and it downloads zone files (which aren't huge) as needed. It can also run around and kill/loot things automatically for you!