This article is inaccurate, and I've seen a lot of reporting on this that is inaccurate and I think it comes from dishonest marketing from AMD.
No, it's not. TechSpot already took a deep look into DLSS a while ago, then they looked again and reported exactly what it does and where it fails:
https://www.techspot.com/article/1712-nvidia-dlss/
DLSS is an anti-aliasing algorithm
No, it's not that either. Read TechSpot's article... "it’s more of an image reconstruction technique that renders a game at a sub-native resolution, then uses AI inferencing to upscale and improve the image"
Now, RIS may be completely different on what it does (as explained in the article) and so are the results, hence the explanation and comparison since both try to achieve better performance with little image degradation.