Anti-grappling exists, as evidenced by MMA fights. I believe all top-rated professional MMA fighters include striking training.
Aljamain Sterling (grappler) vs Sean O'Malley (striker):
1. Sean (with pink hair)
leads Aljamain by moving laterally.
2. Sean feints, controls Aljamain's lead hand, kicks (push) and steps back (pull) to draw Aljamain's counter pressure and reaching.
3. Aljamain tries to grab Sean's lead wrist and throw a straight left.
4. Sean moves laterally and throws a right hand knocking down Aljamain.
Yet, your student does not use your two armed long guard. "He used kicks to close the distance, [then] clinch."
In MMA, elite grapplers integrate striking and grappling with proven strategies, tactics and techniques.