That exactly fits the non-braced suspended rule and is legal.
3.6 (P) ART. 2 . . . Non-braced suspended splits that originate from or pass through
prep level or above are permitted provided all the following conditions are met:
- At least three bases slow the momentum of the top person.
- The top person has both hands in contact with a base(s) once she reaches the full split position.
EXCEPTION: Top person may release one hand to grasp the hand of another base to adjust his/her position.
- At least two of the bases support under the top person’s legs, and the third base may support under the legs or be in contact with the top person’s hands.