Having just gone through the Smog with my 79...
The smog tech has to confirm that everything is present that the vehicle had based on CA, FED, or High altitude emissions. Once that is done, then it goes on the Dyno, the smog machine provides direction to the Tech to run the procedure. At no time does the smog machine share info with the Tech. The gas cap is pressure checked and then the machine will tell you if you passed or failed. I was even asked about my recently installed new CAT, the model number has to be on the Data base as an acceptable replacement. (There were only 3 listed and one is obsolete by the way)
I didn't pass the first time, NAPA sold me the wrong replacement EGR valve, there were 5 listed. I brought the old one in, and they got the "Most Correct" replacement based on the OEM numbers. First test was $80, retest was $40, which I passed with flying colors. I consider myself fortunate, as I grew up in this era and have a pretty good understanding of these vintage smog systems...
The state of California doesn't want these old vehicles on the road, it doesn't matter that there are so few of them left. I suspect that once EV are the only option available to purchase, they will find ways to push the remaining ICE vehicles off the road...