Some can articulate it. Some can't. Some know what they do but feel it gives them an edge and don't want to talk about it. Some just say ghost ball to get off the topic.They know what they do to make shots and get shape but can't articulate it or refuse to.
One world champion explained it to me like this; she said pool is my job and asking me how I do it is like expecting a mechanic or plumber or any other working person to give you the education that they paid and worked for.
She said if she is giving lessons then she doesn't mind talking about it.
And some pros I know have educated themselves on how to teach. That is also a skill.