This is not a logical consequence of a. and b., though it might seem so at first. As a result, stating “as a result of this rule” makes the second part questionable. Is it just that the writers did not think of a robot lifting another or a robot driving up a triangular ally’s robot or a robot jumping upward? Deleting the first phrase and just leaving the second phrase makes it a clear rule by getting rid of this ambiguity.
I would guess this is most important for VEXU since they would design their robots to operate in concert, and I would definitely consider building a robot to climb the other one - not sure I’d do it, but I’d consider it.