Edit:
As it turns out, you have to use -iwad in demos as well. Mistake on my part, sorry.
Original:
I don't know if I am misunderstanding something or doing something wrong, but what is going on with dsdarchive? Can you submit anything to any category without any moderation. I am new to Doom speed running, but I still know the difference between Ultimate Doom and Doom 2. Just look at the "record" for UV Speed Speed running of E1M3. The demo file for it is linked below. What is the speed running website used commonly now, because there is no way it can be that.
If you don't trust the file, check it out for yourself. https://dsdarchive.com/wads/doom/leaderboard?category=UV+Speed&level=E1M3
e1m3-038.zip