His work is often read as an archaic, pre-verbal poetics of the classical world:
https://www.bastian-gallery.com/ausstellungen/cy-twombly-a-m... The scribblings draw from the walls of Pompeii, soft whites and blood reds evoke a certain Greco-Roman pallette etc. Scribbles but more than scribbles.
He was actually criticized for not adhering to postmodernist scripture: https://www.tate.org.uk/research/publications/tate-papers/10...
See also: https://press.princeton.edu/books/hardcover/9780691170725/re...