I was (incorrectly it appears) thinking that Akkadian cuneiform was derived from Sumerian writing...and in that way was quite similar if not related.
As to the part human part alien aspect...that is of course quite consistent with the The Book of Enoch and Genesis ch 6.
As per your request, see post #401 and #398.
I have to get a copy of the Book of Enoch .
I’ve only read bits and pieces translated from the Dead Sea scrolls .