They wrote a raycasting engine in 9800 lines of assembly, running on a Pi, using Doom's textures. Is it Doom? No, but it's pretty darn impressive. Avoid gratuitous negativity.
Which is why they should have advertised something like that. This is related to Doom only in that the music and textures are the same. I'll forgive a little negativity if it comes from someone correcting a dishonestly titled article/submission.
Just because it wasn't Doom doesn't mean it's without merit. This is a first year University project, written in small amount of assembly, with no supporting OS.
You implied it was a trivial achievement. Perhaps that wasn't your intention, perhaps you had intended to encourage, but if that's the case it wasn't obvious.
Right, it does not seem to be a raycasting algorithm, and the author mentions of it in the youtube comments that it's a "rasterization" meaning perspective projection of textured polygons.