So thinking some more. The very fact that the player voiced his intentions that he was raking in case the ball rolled back there should mean it would be a breach of exception 2 to rule 13-4. Would that be right?
2. At any time, the player may smooth sand or soil in a hazard provided this is for the sole purpose of caring for the course and nothing is done to breach Rule 13-2 with respect to his next stroke. If a ball played from a hazard is outside the hazard after the stroke, the player may smooth sand or soil in the hazard without restriction.
So it was made clear by the player that raking was not for the "sole purpose" of caring for the course.
So considering this scenario, my understanding is that the player could have raked here had they not had said anything. However, considering they voiced their intentions it would have ultimately been a breach of Rule 13-4.
Edited by Monty85, 12 February 2018 - 12:45 PM.