The chair referred to procedure. The idea behind this motion is to give witnesses appearing before the committee 10 minutes for their opening statements. Even then, it will depend on how many witnesses we have. It is up to the chair to determine whether we have enough time to hear from all the witnesses. It also deals with the number of rounds of questioning and the time allocated to questioners from each party.
On February 20th, 2020. See this statement in context.