It’s really a statement about what the researchers actually did for this paper, not a statement about what’s required or possible in general now or in the futur

It’s really a statement about what the researchers actually did for this paper, not a statement about what’s required or possible in general now or in the future, right? Because they qualify this is for blank walls both in the abstract and in the video, I’d first assume it’s possible they tried it and ran into substantial issues - even though it might logically seem easy. Maybe it will take a bit more math or engineering to handle non-blank walls, and it’s being saved for the next paper. Since non-blank walls will increase the dimensionality (and training time) of the problem, and likely come with reduced effectiveness in some cases, and since a result with blank walls is good enough for publication, maybe this is just a first step?