Protocols in pro cs tactics and tactical approaches have been existing since at least 2004 (maybe earlier? not sure), the terminology was used, you can go all the way back to player/coach interviews with Thorin ~20 years ago, or you can simply trust me, since I was playing during that time.
Set strats (executes), mid-round protocols, retake protocols, rotations, 2vX situations... all these are religiously practiced in CS for the last 20 years at least, the higher level you end up playing, the more you concentrate on these things. Where do you think Valorant got them from? lol
I'm afraid you're trying to make something true even though its not, simply because you didn't notice the term being used in the last few years on whatever broadcasts you've been watching. It doesn't seem like you actually know what you're saying...