This is old news, it’s working for over 5 years now.
I think the WASM project diabloweb of DevilitionX has not been around for five years?
If you do a quick web search, you can find 5 years old reddit posts that link to the exact same github of d07RiV that is first mentioned in the article. So I suppose DevilitionX will be around for the same amount of time.
now if this worked in mobile with a controller…
With geforce now(and other similar cloud gaming services), you can play all kinds of AAA games in your browser, including diablo 4.