Not very famous. I don't know what is the direct relationship between this person and Aisingiorro Qigong. I know that Essien Gioro was enlightened, and he is also descended from the royal family. His handwriting is also good. Now he is a descendant of the royal family! Now, about 2000 square feet of enlightened calligraphy are exchanged privately. He is a fierce collector, so he seldom sells his own works.
Generally speaking, this work, as you said, depends on your source. If a friend gave it to you, it would be more meaningful and valuable to keep it. If I say appreciation, I don't think it makes sense!