Did you misunderstand the part of these three words *together* being the best three starting guesses? They *together* use all the 15 most common letters in the list of possible answers, and do so in a way that will result in (on average) more green squares than any other three words using those 15 letters.
I've quite clearly stated my methodology and the assumptions it made, so saying that "You want to start with two words" when the whole post was about finding the best triplet of words is a strange take.