Possible info about Zoh Shia

I was listening to this video “https://youtu.be/23dUejtuLB4?si=sYKZLlHonu3iQjSj” and heard something about a monster being able to fight him only once and that is during the story. Only other way to fight them is by joining an SOS flare.

Could this be Zoh shia since no one was able to find any armor of it?