Yeah that looks like a great start, especially with how the NTSC signal is generated and interpreted. I don't see much around simulating the electron beam and its interaction with the phosphors and front of the tube though. I imagine a truly accurate physical simulation would need to use monte carlo methods or similar techniques, almost like an advanced 3D renderer does for global illumination.

Everything I saw about Cathode (also available on the App Store) didn't seem to actually give much detail or confirmation that there was any simulation of those characteristics, more a "fast, accurate emulation", which could easily be a stereotyped / exaggerated experience.