No JS no joy. You see a completely white page, because none of it works without JS, not even an indication can be seen, that JS is required and it is waaay off of anything having a non JS fallback.
The above also means, that any knowledge in there will not be found via search engines. I have had it happen, that there was a forum of some community, and I did not even know it existed, even though I searched loads of stuff about the project. It simply never appeared in any search result ever. It is not discoverable.
Aside from not being discoverable, I find that any traditional forum software works better than discourse. For example I cannot properly see when exactly a reply was written, because it abstacts from a simple timestamp and shows only a month and year for example.