Communicated to me by RFU Head of Officiating for the Community Game
For clarity, RFU Regulation 15, Appendix 9 covers the point;
No player shall use the technique known or referred to as “Squeezeball” and no person involved in the teaching or coaching of rugby may teach or coach to encourage the use the “Squeezeball” technique.
Note: “Squeezeball” is a technique where the ball carrier goes to ground, head forward (touching or close to the ground), irrespective of immediate contact with opponents, usually keeping parallel to the touchline, holding and protecting the ball close to the chest and, when on the ground, pushing the ball back between the legs.
Hope this helps to inform the appropriate behaviour of coaches and for consistent safe application of the law.