That is just a normal sharpening filter. My TV and BenQ monitors have this also, it creates an unwanted halo effect. See Link
https://www.cnet.com/how-to/turn-down-your-tv-sharpness-control/
RIS is different, has it adjusts the sharpness based on contrast on the fly. Enhancing details while not creating unwanted effects like the halo effect.
We still need to see a full review break down to really get an understanding of how good RIS is and its downsides as am sure like DLSS they will be downsides.
I would love to try RIS on Squad.