Yes it's completely different. "No code" is actually all code just written graphically instead of with words. Every instruction that is turned into CPU instructions has to be drawn on a flowchart. If you want the "no code" to add A + B, you had to write A+B in a box on the flowchart. Have you taken a computer class? You must know what a flowchart is.

This Doom was done by having a neural net watch Doom being played. It then recreates the images from Doom based on what it "learned". It doesn't have any code for "mouse click -> call fire shotgun function" Instead it saw that when someone clicked the mouse, pixels on the screen changed in a particular way so it simulates the same pixel pattern it learned.