The Fourth Martial God was the first to have a "Personality Mask not made by humans."
Perhaps it was to humiliate, perhaps to commemorate, or maybe just to declare victory. In any case, Yawgmoth did indeed, in the manner of a Hero, store a small portion of Martial Ancestor's memories online.
This portion of memory was purely "memory of events," with no "knowledge-based memory."
In other words, even if you accessed this memory and learned about "Martial Ancestor Xiang Shan teaching a class on a specific date," you would only remember whether Xiang Shan was distracted, whether he took notes, and whether he found the class "useful" or "boring," but you wouldn't know the specific content of that class.
This was obviously a restriction.
