Thank you very much for your feedback. According to my knowledge, digital printing also uses CYMK. RGB, in this case, is secondary colors and is an additive model which is used for the lights. Monitors, cameras, lights, and our eyes are all based on RGB model.
Besides, in this article, they used RGB plates to colorize the pictures in 1861 which worked decently but was super expensive so it got eventually replaced with CYM plates. That is if I understood it correctly.
If not, please feel free to correct me.
And lastly, in my article I wrote, my main purpose was to show that CYMK is a modern wheel to achieve the widest gamut in the most cost-effective way. :)