What happened to the pyro traveler's slash projectiles?

So in the last act of the Archon quest, we were allowed to trial the pyro traveler and their E could shoot out projectiles with every slash. When I tested the Pmc out, that didn't happen and to me that was the craziest part of his kit. I searched the internet but wasn't able to find any clarity on this, is the effect unlocked after getting C11? If not, jerk move from mihoyo honestly, that ability alone would make me main the traveler.