There is an actual Doom clone game that runs in a A1200 and has equal or better graphics than the original Doom. And, I say game. Not a demo.

What's it called?

I think they probably mean Dread? https://m.youtube.com/watch?v=UE4nOYc0RkA

This looks like a much worse Wolfenstein clone... No 3D as far as I see (all rooms are of the same height, the map is just a 2d maze), no textures on floors on ceilings. Not to mention much lower resolution than wolf3d - the graphics are barely legible.

Wolf3D is just (a 3D view onto) a simple grid shape. So this is doing a bunch of stuff Wolf3D can't do. The linked video talks about (but does not demonstrate) full variable heights which would be even closer to Doom, but this is already able to provide a sense of space and visual variety absent from Wolf3D.

After meat, mustard.