Technically... yes... but given you can do sport specific workouts through the summer now I think the line is being blurred probably there more than anywhere else. Football has contact considerations in their rules still, volleyball is... well... volleyball? There is a limit to that sport specific time though. And the wording on the rules seems like maybe you aren't supposed to use a ball? Links below.

https://www.uiltexas.org/volleyball According to this they can't issue equipment until August 1 and conduct official practices.

Sports conditioning rules here. About as clear as mud with the restrictions in my opinion. https://www.uiltexas.org/athletics/summer-strength-conditioning