It is more like this: the consultant make the interview, just like the ghost writer, to know what to write about. Then the consultant tells the applicant to write about "this, this and that. In this way, and don't forget to mention this and this".
Then the aplicant write it. The consultant read it all and says: "this sentence is out of place, you don't need this one, you must include another one on this paragraph". And this go on and on, 5, 6 or even 10 times. Keep in mind that these are essays of one or two pages. The end result has nothing to do with any original writing from the applicant. It is more like a dictation.
I hope you can see the difference.